sunbear-c22
January 28th, 2019, 07:16 AM
While installing "picocom", I encountered the following issue.
$ picocom --help
The program 'picocom' is currently not installed. You can install it by typing:
sudo apt install picocom
$ sudo apt install picocom
[sudo] password for username:
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages were automatically installed and are no longer required:
teeworlds-data ttf-dejavu-core
Use 'sudo apt autoremove' to remove them.
The following NEW packages will be installed:
picocom
0 upgraded, 1 newly installed, 0 to remove and 5 not upgraded.
Need to get 19.9 kB of archives.
After this operation, 61.4 kB of additional disk space will be used.
Err:1 http://security.ubuntu.com/ubuntu xenial-security/universe amd64 picocom amd64 1.7-2build0.16.04.1
Could not open file /var/cache/apt/archives/partial/picocom_1.7-2build0.16.04.1_amd64.deb - open (30: Read-only file system) [IP: 91.189.88.161 80]
Err:1 http://security.ubuntu.com/ubuntu xenial-security/universe amd64 picocom amd64 1.7-2build0.16.04.1
Could not open file /var/cache/apt/archives/partial/picocom_1.7-2build0.16.04.1_amd64.deb - open (30: Read-only file system) [IP: 91.189.88.161 80]
W: Not using locking for read only lock file /var/lib/dpkg/lock-frontend
W: Not using locking for read only lock file /var/lib/dpkg/lock
W: chown to _apt:root of directory /var/cache/apt/archives/partial failed - SetupAPTPartialDirectory (30: Read-only file system)
W: chmod 0700 of directory /var/cache/apt/archives/partial failed - SetupAPTPartialDirectory (30: Read-only file system)
W: Not using locking for read only lock file /var/cache/apt/archives/lock
W: Problem unlinking the file /var/cache/apt/archives/partial/.apt-acquire-privs-test.kzbSwL - IsAccessibleBySandboxUser (30: Read-only file system)
W: Problem unlinking the file /var/cache/apt/archives/partial/picocom_1.7-2build0.16.04.1_amd64.deb - PrepareFiles (30: Read-only file system)
W: Problem unlinking the file /var/cache/apt/archives/partial/picocom_1.7-2build0.16.04.1_amd64.deb - PrepareFiles (30: Read-only file system)
E: Failed to fetch http://security.ubuntu.com/ubuntu/pool/universe/p/picocom/picocom_1.7-2build0.16.04.1_amd64.deb Could not open file /var/cache/apt/archives/partial/picocom_1.7-2build0.16.04.1_amd64.deb - open (30: Read-only file system) [IP: 91.189.88.161 80]
E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?
Thereafter, I ran "apt-get update" and encountered more errors:
Could not execute 'apt-key' to verify signature (is gnupg installed?)
Ign:4 http://security.ubuntu.com/ubuntu xenial-security InRelease
Ign:5 http://sg.archive.ubuntu.com/ubuntu xenial-updates InRelease
Hit:6 http://archive.canonical.com/ubuntu xenial InRelease
Err:6 http://archive.canonical.com/ubuntu xenial InRelease Couldn't create tempfiles for splitting up /var/lib/apt/lists/archive.canonical.com_ubuntu_dists_xenial_InReleas e
Could not execute 'apt-key' to verify signature (is gnupg installed?)
Ign:7 http://sg.archive.ubuntu.com/ubuntu xenial-backports InRelease
Hit:8 http://ppa.launchpad.net/git-core/ppa/ubuntu xenial InRelease
0% [8 InRelease gpgv 23.8 kB] [Connecting to sg.archive.ubuntu.com (91.189.88.162)] [Waiting for headers] [Connecting to ppa.launchpad.net (91.189.95.83)]Couldn't create tempfiles for splitting up /var/lib/apt/lists/ppa.launchpad.net_git-coreErr:8 http://ppa.launchpad.net/git-core/ppa/ubuntu xenial InRelease
Could not execute 'apt-key' to verify signature (is gnupg installed?)
and also:
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-updates_main_i18n_Translation-en.lz4 - PrepareFiles (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-updates_main_dep11_Components-amd64.yml.lz4 - PrepareFiles (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-updates_main_dep11_icons-64x64.tar.lz4 - PrepareFiles (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-updates_restricted_binary-amd64_Packages.lz4 - PrepareFiles (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-updates_restricted_binary-i386_Packages.lz4 - PrepareFiles (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-updates_restricted_binary-all_Packages - PrepareFiles (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-updates_restricted_i18n_Translation-en%5fSG - PrepareFiles (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-updates_restricted_i18n_Translation-en.lz4 - PrepareFiles (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-updates_restricted_dep11_Components-amd64.yml.lz4 - PrepareFiles (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-updates_restricted_dep11_icons-64x64.tar - PrepareFiles (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-updates_universe_binary-amd64_Packages.lz4 - PrepareFiles (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-updates_universe_binary-i386_Packages.lz4 - PrepareFiles (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-updates_universe_binary-all_Packages - PrepareFiles (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-updates_universe_i18n_Translation-en%5fSG - PrepareFiles (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-updates_universe_i18n_Translation-en.lz4 - PrepareFiles (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-updates_universe_dep11_Components-amd64.yml.lz4 - PrepareFiles (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-updates_universe_dep11_icons-64x64.tar.lz4 - PrepareFiles (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-updates_multiverse_binary-amd64_Packages.lz4 - PrepareFiles (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-updates_multiverse_binary-i386_Packages.lz4 - PrepareFiles (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-updates_multiverse_binary-all_Packages - PrepareFiles (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-updates_multiverse_i18n_Translation-en%5fSG - PrepareFiles (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-updates_multiverse_i18n_Translation-en.lz4 - PrepareFiles (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-updates_multiverse_dep11_Components-amd64.yml.lz4 - PrepareFiles (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-updates_multiverse_dep11_icons-64x64.tar.lz4 - PrepareFiles (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-backports_main_source_Sources.lz4 - PrepareFiles (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-backports_restricted_source_Sources - PrepareFiles (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-backports_main_source_Sources - TransactionAbort (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-backports_universe_source_Sources - TransactionAbort (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-backports_restricted_dep11_Components-amd64.yml - TransactionAbort (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-backports_main_binary-amd64_Packages - TransactionAbort (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-backports_main_binary-i386_Packages - TransactionAbort (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-backports_main_i18n_Translation-en - TransactionAbort (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-backports_main_dep11_Components-amd64.yml - TransactionAbort (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-backports_main_dep11_icons-64x64.tar - TransactionAbort (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-backports_multiverse_dep11_Components-amd64.yml - TransactionAbort (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-backports_multiverse_dep11_icons-64x64.tar - TransactionAbort (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-backports_universe_binary-amd64_Packages - TransactionAbort (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-backports_universe_binary-i386_Packages - TransactionAbort (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-backports_universe_i18n_Translation-en - TransactionAbort (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-backports_universe_dep11_Components-amd64.yml - TransactionAbort (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-backports_universe_dep11_icons-64x64.tar - TransactionAbort (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-backports_universe_source_Sources.lz4 - PrepareFiles (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-backports_multiverse_source_Sources - PrepareFiles (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-backports_restricted_binary-amd64_Packages - PrepareFiles (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-backports_restricted_binary-i386_Packages - PrepareFiles (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-backports_restricted_binary-all_Packages - PrepareFiles (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-backports_restricted_i18n_Translation-en%5fSG - PrepareFiles (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-backports_restricted_i18n_Translation-en - PrepareFiles (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-backports_restricted_dep11_Components-amd64.yml.lz4 - PrepareFiles (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-backports_restricted_dep11_icons-64x64.tar - PrepareFiles (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-backports_main_binary-amd64_Packages.lz4 - PrepareFiles (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-updates_restricted_source_Sources - PrepareFiles (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-updates_restricted_source_Sources - TransactionAbort (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-updates_main_source_Sources - TransactionAbort (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-updates_multiverse_source_Sources - TransactionAbort (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-updates_universe_source_Sources - TransactionAbort (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-updates_main_binary-amd64_Packages - TransactionAbort (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-updates_main_binary-i386_Packages - TransactionAbort (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-updates_main_i18n_Translation-en - TransactionAbort (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-updates_main_dep11_Components-amd64.yml - TransactionAbort (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-updates_main_dep11_icons-64x64.tar - TransactionAbort (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-updates_restricted_binary-amd64_Packages - TransactionAbort (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-updates_restricted_binary-i386_Packages - TransactionAbort (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-updates_restricted_i18n_Translation-en - TransactionAbort (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-updates_restricted_dep11_Components-amd64.yml - TransactionAbort (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-updates_universe_binary-amd64_Packages - TransactionAbort (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-updates_universe_binary-i386_Packages - TransactionAbort (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-updates_universe_i18n_Translation-en - TransactionAbort (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-updates_universe_dep11_Components-amd64.yml - TransactionAbort (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-updates_universe_dep11_icons-64x64.tar - TransactionAbort (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-updates_multiverse_binary-amd64_Packages - TransactionAbort (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-updates_multiverse_binary-i386_Packages - TransactionAbort (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-updates_multiverse_i18n_Translation-en - TransactionAbort (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-updates_multiverse_dep11_Components-amd64.yml - TransactionAbort (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-updates_multiverse_dep11_icons-64x64.tar - TransactionAbort (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-updates_main_source_Sources - PrepareFiles (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-updates_multiverse_source_Sources - PrepareFiles (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-updates_universe_source_Sources - PrepareFiles (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-updates_main_binary-amd64_Packages - PrepareFiles (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-updates_main_binary-i386_Packages - PrepareFiles (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-updates_main_i18n_Translation-en - PrepareFiles (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-updates_main_dep11_Components-amd64.yml - PrepareFiles (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-updates_main_dep11_icons-64x64.tar - PrepareFiles (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-updates_restricted_binary-amd64_Packages - PrepareFiles (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-updates_restricted_binary-i386_Packages - PrepareFiles (30: Read-only file system)
W: Failed to fetch http://sg.archive.ubuntu.com/ubuntu/dists/xenial/InRelease Could not execute 'apt-key' to verify signature (is gnupg installed?)
W: Failed to fetch http://archive.canonical.com/ubuntu/dists/xenial/InRelease Could not execute 'apt-key' to verify signature (is gnupg installed?)
W: Failed to fetch https://download.virtualbox.org/virtualbox/debian/dists/xenial/InRelease Could not execute 'apt-key' to verify signature (is gnupg installed?)
W: Failed to fetch http://ppa.launchpad.net/elementary-add-team/icons/ubuntu/dists/xenial/InRelease Could not execute 'apt-key' to verify signature (is gnupg installed?)
W: Failed to fetch http://ppa.launchpad.net/git-core/ppa/ubuntu/dists/xenial/InRelease Could not execute 'apt-key' to verify signature (is gnupg installed?)
W: Failed to fetch http://ppa.launchpad.net/graphics-drivers/ppa/ubuntu/dists/xenial/InRelease Could not execute 'apt-key' to verify signature (is gnupg installed?)
W: Failed to fetch http://ppa.launchpad.net/inkscape.dev/stable/ubuntu/dists/xenial/InRelease Could not execute 'apt-key' to verify signature (is gnupg installed?)
W: Failed to fetch http://ppa.launchpad.net/moka/daily/ubuntu/dists/xenial/InRelease Could not execute 'apt-key' to verify signature (is gnupg installed?)
W: Failed to fetch http://ppa.launchpad.net/nilarimogard/webupd8/ubuntu/dists/xenial/InRelease Could not execute 'apt-key' to verify signature (is gnupg installed?)
W: Failed to fetch http://ppa.launchpad.net/noobslab/icons/ubuntu/dists/xenial/InRelease Could not execute 'apt-key' to verify signature (is gnupg installed?)
W: Failed to fetch http://ppa.launchpad.net/noobslab/icons2/ubuntu/dists/xenial/InRelease Could not execute 'apt-key' to verify signature (is gnupg installed?)
W: Failed to fetch http://ppa.launchpad.net/noobslab/macbuntu/ubuntu/dists/xenial/InRelease Could not execute 'apt-key' to verify signature (is gnupg installed?)
W: Failed to fetch http://ppa.launchpad.net/noobslab/themes/ubuntu/dists/xenial/InRelease Could not execute 'apt-key' to verify signature (is gnupg installed?)
W: Failed to fetch http://ppa.launchpad.net/numix/ppa/ubuntu/dists/xenial/InRelease Could not execute 'apt-key' to verify signature (is gnupg installed?)
W: Failed to fetch http://ppa.launchpad.net/openshot.developers/libopenshot-daily/ubuntu/dists/xenial/InRelease Could not execute 'apt-key' to verify signature (is gnupg installed?)
W: Failed to fetch http://ppa.launchpad.net/oranchelo/oranchelo-icon-theme/ubuntu/dists/xenial/InRelease Could not execute 'apt-key' to verify signature (is gnupg installed?)
W: Failed to fetch http://ppa.launchpad.net/ravefinity-project/ppa/ubuntu/dists/xenial/InRelease Could not execute 'apt-key' to verify signature (is gnupg installed?)
W: Failed to fetch http://ppa.launchpad.net/snwh/pulp/ubuntu/dists/xenial/InRelease Could not execute 'apt-key' to verify signature (is gnupg installed?)
W: Failed to fetch http://ppa.launchpad.net/tista/adapta/ubuntu/dists/xenial/InRelease Could not execute 'apt-key' to verify signature (is gnupg installed?)
W: Failed to fetch http://ppa.launchpad.net/ubuntu-toolchain-r/test/ubuntu/dists/xenial/InRelease Could not execute 'apt-key' to verify signature (is gnupg installed?)
E: Failed to fetch http://security.ubuntu.com/ubuntu/dists/xenial-security/restricted/source/Sources Could not open file /var/lib/apt/lists/partial/security.ubuntu.com_ubuntu_dists_xenial-security_restricted_source_Sources.xz - open (30: Read-only file system) [IP: 91.189.91.23 80]
E: Failed to fetch http://sg.archive.ubuntu.com/ubuntu/dists/xenial-backports/restricted/source/Sources Could not open file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-backports_restricted_source_Sources.xz - open (30: Read-only file system) [IP: 91.189.88.161 80]
E: Failed to fetch http://sg.archive.ubuntu.com/ubuntu/dists/xenial-updates/restricted/source/Sources Could not open file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-updates_restricted_source_Sources.xz - open (30: Read-only file system) [IP: 91.189.88.161 80]
W: Some index files failed to download. They have been ignored, or old ones used instead.
W: Problem unlinking the file /var/cache/apt/pkgcache.bin - RemoveCaches (30: Read-only file system)
W: Problem unlinking the file /var/cache/apt/srcpkgcache.bin - RemoveCaches (30: Read-only file system)
Below is /tmp 's permission, seems alright.
ls -ld /tmp
drwxrwxrwt 15 root root 4096 Jan 28 10:54 /tmp
Also, gnupg is installed.
$ dpkg -l | grep gnupg
ii gnupg 1.4.20-1ubuntu3.3 amd64 GNU privacy guard - a free PGP replacement
ii gnupg-agent 2.1.11-6ubuntu2.1 amd64 GNU privacy guard - cryptographic agent
ii gnupg2 2.1.11-6ubuntu2.1 amd64 GNU privacy guard - a free PGP replacement (new v2.x)
At the moment, command `sudo apt update` can't work. How can i fix this issue?
$ picocom --help
The program 'picocom' is currently not installed. You can install it by typing:
sudo apt install picocom
$ sudo apt install picocom
[sudo] password for username:
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages were automatically installed and are no longer required:
teeworlds-data ttf-dejavu-core
Use 'sudo apt autoremove' to remove them.
The following NEW packages will be installed:
picocom
0 upgraded, 1 newly installed, 0 to remove and 5 not upgraded.
Need to get 19.9 kB of archives.
After this operation, 61.4 kB of additional disk space will be used.
Err:1 http://security.ubuntu.com/ubuntu xenial-security/universe amd64 picocom amd64 1.7-2build0.16.04.1
Could not open file /var/cache/apt/archives/partial/picocom_1.7-2build0.16.04.1_amd64.deb - open (30: Read-only file system) [IP: 91.189.88.161 80]
Err:1 http://security.ubuntu.com/ubuntu xenial-security/universe amd64 picocom amd64 1.7-2build0.16.04.1
Could not open file /var/cache/apt/archives/partial/picocom_1.7-2build0.16.04.1_amd64.deb - open (30: Read-only file system) [IP: 91.189.88.161 80]
W: Not using locking for read only lock file /var/lib/dpkg/lock-frontend
W: Not using locking for read only lock file /var/lib/dpkg/lock
W: chown to _apt:root of directory /var/cache/apt/archives/partial failed - SetupAPTPartialDirectory (30: Read-only file system)
W: chmod 0700 of directory /var/cache/apt/archives/partial failed - SetupAPTPartialDirectory (30: Read-only file system)
W: Not using locking for read only lock file /var/cache/apt/archives/lock
W: Problem unlinking the file /var/cache/apt/archives/partial/.apt-acquire-privs-test.kzbSwL - IsAccessibleBySandboxUser (30: Read-only file system)
W: Problem unlinking the file /var/cache/apt/archives/partial/picocom_1.7-2build0.16.04.1_amd64.deb - PrepareFiles (30: Read-only file system)
W: Problem unlinking the file /var/cache/apt/archives/partial/picocom_1.7-2build0.16.04.1_amd64.deb - PrepareFiles (30: Read-only file system)
E: Failed to fetch http://security.ubuntu.com/ubuntu/pool/universe/p/picocom/picocom_1.7-2build0.16.04.1_amd64.deb Could not open file /var/cache/apt/archives/partial/picocom_1.7-2build0.16.04.1_amd64.deb - open (30: Read-only file system) [IP: 91.189.88.161 80]
E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?
Thereafter, I ran "apt-get update" and encountered more errors:
Could not execute 'apt-key' to verify signature (is gnupg installed?)
Ign:4 http://security.ubuntu.com/ubuntu xenial-security InRelease
Ign:5 http://sg.archive.ubuntu.com/ubuntu xenial-updates InRelease
Hit:6 http://archive.canonical.com/ubuntu xenial InRelease
Err:6 http://archive.canonical.com/ubuntu xenial InRelease Couldn't create tempfiles for splitting up /var/lib/apt/lists/archive.canonical.com_ubuntu_dists_xenial_InReleas e
Could not execute 'apt-key' to verify signature (is gnupg installed?)
Ign:7 http://sg.archive.ubuntu.com/ubuntu xenial-backports InRelease
Hit:8 http://ppa.launchpad.net/git-core/ppa/ubuntu xenial InRelease
0% [8 InRelease gpgv 23.8 kB] [Connecting to sg.archive.ubuntu.com (91.189.88.162)] [Waiting for headers] [Connecting to ppa.launchpad.net (91.189.95.83)]Couldn't create tempfiles for splitting up /var/lib/apt/lists/ppa.launchpad.net_git-coreErr:8 http://ppa.launchpad.net/git-core/ppa/ubuntu xenial InRelease
Could not execute 'apt-key' to verify signature (is gnupg installed?)
and also:
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-updates_main_i18n_Translation-en.lz4 - PrepareFiles (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-updates_main_dep11_Components-amd64.yml.lz4 - PrepareFiles (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-updates_main_dep11_icons-64x64.tar.lz4 - PrepareFiles (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-updates_restricted_binary-amd64_Packages.lz4 - PrepareFiles (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-updates_restricted_binary-i386_Packages.lz4 - PrepareFiles (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-updates_restricted_binary-all_Packages - PrepareFiles (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-updates_restricted_i18n_Translation-en%5fSG - PrepareFiles (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-updates_restricted_i18n_Translation-en.lz4 - PrepareFiles (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-updates_restricted_dep11_Components-amd64.yml.lz4 - PrepareFiles (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-updates_restricted_dep11_icons-64x64.tar - PrepareFiles (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-updates_universe_binary-amd64_Packages.lz4 - PrepareFiles (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-updates_universe_binary-i386_Packages.lz4 - PrepareFiles (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-updates_universe_binary-all_Packages - PrepareFiles (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-updates_universe_i18n_Translation-en%5fSG - PrepareFiles (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-updates_universe_i18n_Translation-en.lz4 - PrepareFiles (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-updates_universe_dep11_Components-amd64.yml.lz4 - PrepareFiles (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-updates_universe_dep11_icons-64x64.tar.lz4 - PrepareFiles (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-updates_multiverse_binary-amd64_Packages.lz4 - PrepareFiles (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-updates_multiverse_binary-i386_Packages.lz4 - PrepareFiles (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-updates_multiverse_binary-all_Packages - PrepareFiles (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-updates_multiverse_i18n_Translation-en%5fSG - PrepareFiles (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-updates_multiverse_i18n_Translation-en.lz4 - PrepareFiles (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-updates_multiverse_dep11_Components-amd64.yml.lz4 - PrepareFiles (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-updates_multiverse_dep11_icons-64x64.tar.lz4 - PrepareFiles (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-backports_main_source_Sources.lz4 - PrepareFiles (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-backports_restricted_source_Sources - PrepareFiles (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-backports_main_source_Sources - TransactionAbort (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-backports_universe_source_Sources - TransactionAbort (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-backports_restricted_dep11_Components-amd64.yml - TransactionAbort (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-backports_main_binary-amd64_Packages - TransactionAbort (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-backports_main_binary-i386_Packages - TransactionAbort (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-backports_main_i18n_Translation-en - TransactionAbort (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-backports_main_dep11_Components-amd64.yml - TransactionAbort (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-backports_main_dep11_icons-64x64.tar - TransactionAbort (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-backports_multiverse_dep11_Components-amd64.yml - TransactionAbort (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-backports_multiverse_dep11_icons-64x64.tar - TransactionAbort (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-backports_universe_binary-amd64_Packages - TransactionAbort (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-backports_universe_binary-i386_Packages - TransactionAbort (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-backports_universe_i18n_Translation-en - TransactionAbort (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-backports_universe_dep11_Components-amd64.yml - TransactionAbort (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-backports_universe_dep11_icons-64x64.tar - TransactionAbort (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-backports_universe_source_Sources.lz4 - PrepareFiles (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-backports_multiverse_source_Sources - PrepareFiles (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-backports_restricted_binary-amd64_Packages - PrepareFiles (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-backports_restricted_binary-i386_Packages - PrepareFiles (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-backports_restricted_binary-all_Packages - PrepareFiles (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-backports_restricted_i18n_Translation-en%5fSG - PrepareFiles (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-backports_restricted_i18n_Translation-en - PrepareFiles (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-backports_restricted_dep11_Components-amd64.yml.lz4 - PrepareFiles (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-backports_restricted_dep11_icons-64x64.tar - PrepareFiles (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-backports_main_binary-amd64_Packages.lz4 - PrepareFiles (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-updates_restricted_source_Sources - PrepareFiles (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-updates_restricted_source_Sources - TransactionAbort (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-updates_main_source_Sources - TransactionAbort (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-updates_multiverse_source_Sources - TransactionAbort (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-updates_universe_source_Sources - TransactionAbort (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-updates_main_binary-amd64_Packages - TransactionAbort (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-updates_main_binary-i386_Packages - TransactionAbort (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-updates_main_i18n_Translation-en - TransactionAbort (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-updates_main_dep11_Components-amd64.yml - TransactionAbort (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-updates_main_dep11_icons-64x64.tar - TransactionAbort (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-updates_restricted_binary-amd64_Packages - TransactionAbort (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-updates_restricted_binary-i386_Packages - TransactionAbort (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-updates_restricted_i18n_Translation-en - TransactionAbort (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-updates_restricted_dep11_Components-amd64.yml - TransactionAbort (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-updates_universe_binary-amd64_Packages - TransactionAbort (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-updates_universe_binary-i386_Packages - TransactionAbort (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-updates_universe_i18n_Translation-en - TransactionAbort (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-updates_universe_dep11_Components-amd64.yml - TransactionAbort (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-updates_universe_dep11_icons-64x64.tar - TransactionAbort (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-updates_multiverse_binary-amd64_Packages - TransactionAbort (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-updates_multiverse_binary-i386_Packages - TransactionAbort (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-updates_multiverse_i18n_Translation-en - TransactionAbort (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-updates_multiverse_dep11_Components-amd64.yml - TransactionAbort (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-updates_multiverse_dep11_icons-64x64.tar - TransactionAbort (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-updates_main_source_Sources - PrepareFiles (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-updates_multiverse_source_Sources - PrepareFiles (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-updates_universe_source_Sources - PrepareFiles (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-updates_main_binary-amd64_Packages - PrepareFiles (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-updates_main_binary-i386_Packages - PrepareFiles (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-updates_main_i18n_Translation-en - PrepareFiles (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-updates_main_dep11_Components-amd64.yml - PrepareFiles (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-updates_main_dep11_icons-64x64.tar - PrepareFiles (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-updates_restricted_binary-amd64_Packages - PrepareFiles (30: Read-only file system)
W: Problem unlinking the file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-updates_restricted_binary-i386_Packages - PrepareFiles (30: Read-only file system)
W: Failed to fetch http://sg.archive.ubuntu.com/ubuntu/dists/xenial/InRelease Could not execute 'apt-key' to verify signature (is gnupg installed?)
W: Failed to fetch http://archive.canonical.com/ubuntu/dists/xenial/InRelease Could not execute 'apt-key' to verify signature (is gnupg installed?)
W: Failed to fetch https://download.virtualbox.org/virtualbox/debian/dists/xenial/InRelease Could not execute 'apt-key' to verify signature (is gnupg installed?)
W: Failed to fetch http://ppa.launchpad.net/elementary-add-team/icons/ubuntu/dists/xenial/InRelease Could not execute 'apt-key' to verify signature (is gnupg installed?)
W: Failed to fetch http://ppa.launchpad.net/git-core/ppa/ubuntu/dists/xenial/InRelease Could not execute 'apt-key' to verify signature (is gnupg installed?)
W: Failed to fetch http://ppa.launchpad.net/graphics-drivers/ppa/ubuntu/dists/xenial/InRelease Could not execute 'apt-key' to verify signature (is gnupg installed?)
W: Failed to fetch http://ppa.launchpad.net/inkscape.dev/stable/ubuntu/dists/xenial/InRelease Could not execute 'apt-key' to verify signature (is gnupg installed?)
W: Failed to fetch http://ppa.launchpad.net/moka/daily/ubuntu/dists/xenial/InRelease Could not execute 'apt-key' to verify signature (is gnupg installed?)
W: Failed to fetch http://ppa.launchpad.net/nilarimogard/webupd8/ubuntu/dists/xenial/InRelease Could not execute 'apt-key' to verify signature (is gnupg installed?)
W: Failed to fetch http://ppa.launchpad.net/noobslab/icons/ubuntu/dists/xenial/InRelease Could not execute 'apt-key' to verify signature (is gnupg installed?)
W: Failed to fetch http://ppa.launchpad.net/noobslab/icons2/ubuntu/dists/xenial/InRelease Could not execute 'apt-key' to verify signature (is gnupg installed?)
W: Failed to fetch http://ppa.launchpad.net/noobslab/macbuntu/ubuntu/dists/xenial/InRelease Could not execute 'apt-key' to verify signature (is gnupg installed?)
W: Failed to fetch http://ppa.launchpad.net/noobslab/themes/ubuntu/dists/xenial/InRelease Could not execute 'apt-key' to verify signature (is gnupg installed?)
W: Failed to fetch http://ppa.launchpad.net/numix/ppa/ubuntu/dists/xenial/InRelease Could not execute 'apt-key' to verify signature (is gnupg installed?)
W: Failed to fetch http://ppa.launchpad.net/openshot.developers/libopenshot-daily/ubuntu/dists/xenial/InRelease Could not execute 'apt-key' to verify signature (is gnupg installed?)
W: Failed to fetch http://ppa.launchpad.net/oranchelo/oranchelo-icon-theme/ubuntu/dists/xenial/InRelease Could not execute 'apt-key' to verify signature (is gnupg installed?)
W: Failed to fetch http://ppa.launchpad.net/ravefinity-project/ppa/ubuntu/dists/xenial/InRelease Could not execute 'apt-key' to verify signature (is gnupg installed?)
W: Failed to fetch http://ppa.launchpad.net/snwh/pulp/ubuntu/dists/xenial/InRelease Could not execute 'apt-key' to verify signature (is gnupg installed?)
W: Failed to fetch http://ppa.launchpad.net/tista/adapta/ubuntu/dists/xenial/InRelease Could not execute 'apt-key' to verify signature (is gnupg installed?)
W: Failed to fetch http://ppa.launchpad.net/ubuntu-toolchain-r/test/ubuntu/dists/xenial/InRelease Could not execute 'apt-key' to verify signature (is gnupg installed?)
E: Failed to fetch http://security.ubuntu.com/ubuntu/dists/xenial-security/restricted/source/Sources Could not open file /var/lib/apt/lists/partial/security.ubuntu.com_ubuntu_dists_xenial-security_restricted_source_Sources.xz - open (30: Read-only file system) [IP: 91.189.91.23 80]
E: Failed to fetch http://sg.archive.ubuntu.com/ubuntu/dists/xenial-backports/restricted/source/Sources Could not open file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-backports_restricted_source_Sources.xz - open (30: Read-only file system) [IP: 91.189.88.161 80]
E: Failed to fetch http://sg.archive.ubuntu.com/ubuntu/dists/xenial-updates/restricted/source/Sources Could not open file /var/lib/apt/lists/partial/sg.archive.ubuntu.com_ubuntu_dists_xenial-updates_restricted_source_Sources.xz - open (30: Read-only file system) [IP: 91.189.88.161 80]
W: Some index files failed to download. They have been ignored, or old ones used instead.
W: Problem unlinking the file /var/cache/apt/pkgcache.bin - RemoveCaches (30: Read-only file system)
W: Problem unlinking the file /var/cache/apt/srcpkgcache.bin - RemoveCaches (30: Read-only file system)
Below is /tmp 's permission, seems alright.
ls -ld /tmp
drwxrwxrwt 15 root root 4096 Jan 28 10:54 /tmp
Also, gnupg is installed.
$ dpkg -l | grep gnupg
ii gnupg 1.4.20-1ubuntu3.3 amd64 GNU privacy guard - a free PGP replacement
ii gnupg-agent 2.1.11-6ubuntu2.1 amd64 GNU privacy guard - cryptographic agent
ii gnupg2 2.1.11-6ubuntu2.1 amd64 GNU privacy guard - a free PGP replacement (new v2.x)
At the moment, command `sudo apt update` can't work. How can i fix this issue?