Can't install Synaptic

[Nikhil1991]

I am new to Linux. I've installed Ubuntu 11.10 and since it doesn't have Synaptic Package Manager installed by default, i tried using

sudo apt-get install synaptic from the terminal.

but i always keep getting this..

Reading package lists... Done
Building dependency tree
Reading state information... Done
Package synaptic is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source

E: Package 'synaptic' has no installation candidate

what do i do? please help!

[Cha0sBG]

Try to install it from the Ubuntu Software center.

[Nikhil1991]

I tried the Software Center too. I double-click on the Synaptic app there, it starts updating cache which never completes and i get this error message
Failed to download repository information
Check your Internet connection

and in the details..

W:GPG error: http://archive.ubuntu.com oneiric InRelease: File /var/lib/apt/lists/partial/archive.ubuntu.com_ubuntu_dists_oneiric_InRelease doesn't start with a clearsigned message, W:GPG error: http://archive.ubuntu.com oneiric-updates InRelease: File /var/lib/apt/lists/partial/archive.ubuntu.com_ubuntu_dists_oneiric-updates_InRelease doesn't start with a clearsigned message, W:GPG error: http://archive.ubuntu.com oneiric-backports InRelease: File /var/lib/apt/lists/partial/archive.ubuntu.com_ubuntu_dists_oneiric-backports_InRelease doesn't start with a clearsigned message, W:GPG error: http://archive.ubuntu.com oneiric-security InRelease: File /var/lib/apt/lists/partial/archive.ubuntu.com_ubuntu_dists_oneiric-security_InRelease doesn't start with a clearsigned message, W:GPG error: http://www.fbreader.org stable Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY B5FC5445BA702101, W:Failed to fetch gzip:/var/lib/apt/lists/partial/archive.ubuntu.com_ubuntu_dists_oneiric_main_sourc e_Sources Encountered a section with no Package: header
, W:Failed to fetch gzip:/var/lib/apt/lists/partial/archive.ubuntu.com_ubuntu_dists_oneiric_restricted _source_Sources Encountered a section with no Package: header
, W:Failed to fetch gzip:/var/lib/apt/lists/partial/archive.ubuntu.com_ubuntu_dists_oneiric_universe_s ource_Sources Encountered a section with no Package: header
, W:Failed to fetch gzip:/var/lib/apt/lists/partial/archive.ubuntu.com_ubuntu_dists_oneiric_multiverse _source_Sources Encountered a section with no Package: header
, W:Failed to fetch gzip:/var/lib/apt/lists/partial/archive.ubuntu.com_ubuntu_dists_oneiric_universe_b inary-amd64_Packages Encountered a section with no Package: header
, W:Failed to fetch gzip:/var/lib/apt/lists/partial/archive.ubuntu.com_ubuntu_dists_oneiric_multiverse _binary-amd64_Packages Encountered a section with no Package: header
, W:Failed to fetch gzip:/var/lib/apt/lists/partial/archive.ubuntu.com_ubuntu_dists_oneiric_universe_b inary-i386_Packages Encountered a section with no Package: header
, W:Failed to fetch gzip:/var/lib/apt/lists/partial/archive.ubuntu.com_ubuntu_dists_oneiric_multiverse _binary-i386_Packages Encountered a section with no Package: header
, W:Failed to fetch http://archive.ubuntu.com/ubuntu/dis...ain/i18n/Index No Hash entry in Release file /var/lib/apt/lists/partial/archive.ubuntu.com_ubuntu_dists_oneiric_main_i18n_ Index
, W:Failed to fetch http://archive.ubuntu.com/ubuntu/dis...rse/i18n/Index No Hash entry in Release file /var/lib/apt/lists/partial/archive.ubuntu.com_ubuntu_dists_oneiric_multiverse _i18n_Index
, W:Failed to fetch http://archive.ubuntu.com/ubuntu/dis...ted/i18n/Index No Hash entry in Release file /var/lib/apt/lists/partial/archive.ubuntu.com_ubuntu_dists_oneiric_restricted _i18n_Index
, W:Failed to fetch http://archive.ubuntu.com/ubuntu/dis...rse/i18n/Index No Hash entry in Release file /var/lib/apt/lists/partial/archive.ubuntu.com_ubuntu_dists_oneiric_universe_i 18n_Index
, W:Failed to fetch gzip:/var/lib/apt/lists/partial/archive.ubuntu.com_ubuntu_dists_oneiric-updates_main_source_Sources Encountered a section with no Package: header
, W:Failed to fetch gzip:/var/lib/apt/lists/partial/archive.ubuntu.com_ubuntu_dists_oneiric-updates_restricted_source_Sources Encountered a section with no Package: header
, W:Failed to fetch gzip:/var/lib/apt/lists/partial/archive.ubuntu.com_ubuntu_dists_oneiric-updates_universe_source_Sources Encountered a section with no Package: header
, W:Failed to fetch gzip:/var/lib/apt/lists/partial/archive.ubuntu.com_ubuntu_dists_oneiric-updates_multiverse_source_Sources Encountered a section with no Package: header
, W:Failed to fetch gzip:/var/lib/apt/lists/partial/archive.ubuntu.com_ubuntu_dists_oneiric-updates_universe_binary-amd64_Packages Encountered a section with no Package: header
, W:Failed to fetch gzip:/var/lib/apt/lists/partial/archive.ubuntu.com_ubuntu_dists_oneiric-updates_multiverse_binary-amd64_Packages Encountered a section with no Package: header
, W:Failed to fetch gzip:/var/lib/apt/lists/partial/archive.ubuntu.com_ubuntu_dists_oneiric-updates_universe_binary-i386_Packages Encountered a section with no Package: header
, W:Failed to fetch gzip:/var/lib/apt/lists/partial/archive.ubuntu.com_ubuntu_dists_oneiric-updates_multiverse_binary-i386_Packages Encountered a section with no Package: header
, W:Failed to fetch http://archive.ubuntu.com/ubuntu/dis...ain/i18n/Index No Hash entry in Release file /var/lib/apt/lists/partial/archive.ubuntu.com_ubuntu_dists_oneiric-updates_main_i18n_Index
, W:Failed to fetch http://archive.ubuntu.com/ubuntu/dis...rse/i18n/Index No Hash entry in Release file /var/lib/apt/lists/partial/archive.ubuntu.com_ubuntu_dists_oneiric-updates_multiverse_i18n_Index
, W:Failed to fetch http://archive.ubuntu.com/ubuntu/dis...ted/i18n/Index No Hash entry in Release file /var/lib/apt/lists/partial/archive.ubuntu.com_ubuntu_dists_oneiric-updates_restricted_i18n_Index
, W:Failed to fetch http://archive.ubuntu.com/ubuntu/dis...rse/i18n/Index No Hash entry in Release file /var/lib/apt/lists/partial/archive.ubuntu.com_ubuntu_dists_oneiric-updates_universe_i18n_Index
, W:Failed to fetch gzip:/var/lib/apt/lists/partial/archive.ubuntu.com_ubuntu_dists_oneiric-backports_main_source_Sources Encountered a section with no Package: header
, W:Failed to fetch gzip:/var/lib/apt/lists/partial/archive.ubuntu.com_ubuntu_dists_oneiric-backports_restricted_source_Sources Encountered a section with no Package: header
, W:Failed to fetch gzip:/var/lib/apt/lists/partial/archive.ubuntu.com_ubuntu_dists_oneiric-backports_universe_source_Sources Encountered a section with no Package: header
, W:Failed to fetch gzip:/var/lib/apt/lists/partial/archive.ubuntu.com_ubuntu_dists_oneiric-backports_multiverse_source_Sources Encountered a section with no Package: header
, W:Failed to fetch gzip:/var/lib/apt/lists/partial/archive.ubuntu.com_ubuntu_dists_oneiric-backports_main_binary-amd64_Packages Encountered a section with no Package: header
, W:Failed to fetch gzip:/var/lib/apt/lists/partial/archive.ubuntu.com_ubuntu_dists_oneiric-backports_restricted_binary-amd64_Packages Encountered a section with no Package: header
, W:Failed to fetch gzip:/var/lib/apt/lists/partial/archive.ubuntu.com_ubuntu_dists_oneiric-backports_universe_binary-amd64_Packages Encountered a section with no Package: header
, W:Failed to fetch gzip:/var/lib/apt/lists/partial/archive.ubuntu.com_ubuntu_dists_oneiric-backports_multiverse_binary-amd64_Packages Encountered a section with no Package: header
, W:Failed to fetch gzip:/var/lib/apt/lists/partial/archive.ubuntu.com_ubuntu_dists_oneiric-backports_main_binary-i386_Packages Encountered a section with no Package: header
, W:Failed to fetch gzip:/var/lib/apt/lists/partial/archive.ubuntu.com_ubuntu_dists_oneiric-backports_restricted_binary-i386_Packages Encountered a section with no Package: header
, W:Failed to fetch gzip:/var/lib/apt/lists/partial/archive.ubuntu.com_ubuntu_dists_oneiric-backports_universe_binary-i386_Packages Encountered a section with no Package: header
, W:Failed to fetch gzip:/var/lib/apt/lists/partial/archive.ubuntu.com_ubuntu_dists_oneiric-backports_multiverse_binary-i386_Packages Encountered a section with no Package: header
, W:Failed to fetch http://archive.ubuntu.com/ubuntu/dis...ain/i18n/Index No Hash entry in Release file /var/lib/apt/lists/partial/archive.ubuntu.com_ubuntu_dists_oneiric-backports_main_i18n_Index
, W:Failed to fetch http://archive.ubuntu.com/ubuntu/dis...rse/i18n/Index No Hash entry in Release file /var/lib/apt/lists/partial/archive.ubuntu.com_ubuntu_dists_oneiric-backports_multiverse_i18n_Index
, W:Failed to fetch http://archive.ubuntu.com/ubuntu/dis...ted/i18n/Index No Hash entry in Release file /var/lib/apt/lists/partial/archive.ubuntu.com_ubuntu_dists_oneiric-backports_restricted_i18n_Index
, W:Failed to fetch http://archive.ubuntu.com/ubuntu/dis...rse/i18n/Index No Hash entry in Release file /var/lib/apt/lists/partial/archive.ubuntu.com_ubuntu_dists_oneiric-backports_universe_i18n_Index
, W:Failed to fetch gzip:/var/lib/apt/lists/partial/archive.ubuntu.com_ubuntu_dists_oneiric-security_main_source_Sources Encountered a section with no Package: header
, W:Failed to fetch gzip:/var/lib/apt/lists/partial/archive.ubuntu.com_ubuntu_dists_oneiric-security_restricted_source_Sources Encountered a section with no Package: header
, W:Failed to fetch gzip:/var/lib/apt/lists/partial/archive.ubuntu.com_ubuntu_dists_oneiric-security_universe_source_Sources Encountered a section with no Package: header
, W:Failed to fetch gzip:/var/lib/apt/lists/partial/archive.ubuntu.com_ubuntu_dists_oneiric-security_multiverse_source_Sources Encountered a section with no Package: header
, W:Failed to fetch gzip:/var/lib/apt/lists/partial/archive.ubuntu.com_ubuntu_dists_oneiric-security_main_binary-amd64_Packages Encountered a section with no Package: header
, W:Failed to fetch gzip:/var/lib/apt/lists/partial/archive.ubuntu.com_ubuntu_dists_oneiric-security_restricted_binary-amd64_Packages Encountered a section with no Package: header
, W:Failed to fetch gzip:/var/lib/apt/lists/partial/archive.ubuntu.com_ubuntu_dists_oneiric-security_universe_binary-amd64_Packages Encountered a section with no Package: header
, W:Failed to fetch gzip:/var/lib/apt/lists/partial/archive.ubuntu.com_ubuntu_dists_oneiric-security_multiverse_binary-amd64_Packages Encountered a section with no Package: header
, W:Failed to fetch gzip:/var/lib/apt/lists/partial/archive.ubuntu.com_ubuntu_dists_oneiric-security_main_binary-i386_Packages Encountered a section with no Package: header
, W:Failed to fetch gzip:/var/lib/apt/lists/partial/archive.ubuntu.com_ubuntu_dists_oneiric-security_restricted_binary-i386_Packages Encountered a section with no Package: header
, W:Failed to fetch gzip:/var/lib/apt/lists/partial/archive.ubuntu.com_ubuntu_dists_oneiric-security_universe_binary-i386_Packages Encountered a section with no Package: header
, W:Failed to fetch gzip:/var/lib/apt/lists/partial/archive.ubuntu.com_ubuntu_dists_oneiric-security_multiverse_binary-i386_Packages Encountered a section with no Package: header
, W:Failed to fetch http://archive.ubuntu.com/ubuntu/dis...ain/i18n/Index No Hash entry in Release file /var/lib/apt/lists/partial/archive.ubuntu.com_ubuntu_dists_oneiric-security_main_i18n_Index
, W:Failed to fetch http://archive.ubuntu.com/ubuntu/dis...rse/i18n/Index No Hash entry in Release file /var/lib/apt/lists/partial/archive.ubuntu.com_ubuntu_dists_oneiric-security_multiverse_i18n_Index
, W:Failed to fetch http://archive.ubuntu.com/ubuntu/dis...ted/i18n/Index No Hash entry in Release file /var/lib/apt/lists/partial/archive.ubuntu.com_ubuntu_dists_oneiric-security_restricted_i18n_Index
, W:Failed to fetch http://archive.ubuntu.com/ubuntu/dis...rse/i18n/Index No Hash entry in Release file /var/lib/apt/lists/partial/archive.ubuntu.com_ubuntu_dists_oneiric-security_universe_i18n_Index
, W:Failed to fetch gzip:/var/lib/apt/lists/partial/archive.ubuntu.com_ubuntu_dists_oneiric_main_binar y-amd64_Packages Encountered a section with no Package: header
, W:Failed to fetch gzip:/var/lib/apt/lists/partial/archive.ubuntu.com_ubuntu_dists_oneiric_restricted _binary-amd64_Packages Encountered a section with no Package: header
, W:Failed to fetch gzip:/var/lib/apt/lists/partial/archive.ubuntu.com_ubuntu_dists_oneiric_main_binar y-i386_Packages Encountered a section with no Package: header
, W:Failed to fetch gzip:/var/lib/apt/lists/partial/archive.ubuntu.com_ubuntu_dists_oneiric_restricted _binary-i386_Packages Encountered a section with no Package: header
, W:Failed to fetch gzip:/var/lib/apt/lists/partial/archive.ubuntu.com_ubuntu_dists_oneiric-updates_main_binary-amd64_Packages Encountered a section with no Package: header
, W:Failed to fetch gzip:/var/lib/apt/lists/partial/archive.ubuntu.com_ubuntu_dists_oneiric-updates_restricted_binary-amd64_Packages Encountered a section with no Package: header
, W:Failed to fetch gzip:/var/lib/apt/lists/partial/archive.ubuntu.com_ubuntu_dists_oneiric-updates_main_binary-i386_Packages Encountered a section with no Package: header
, W:Failed to fetch gzip:/var/lib/apt/lists/partial/archive.ubuntu.com_ubuntu_dists_oneiric-updates_restricted_binary-i386_Packages Encountered a section with no Package: header
, E:Some index files failed to download. They have been ignored, or old ones used instead.

It's not a network problem. I use a proxy and i'm sure i've configured it all right.

[oldos2er]

Have you tried running

sudo apt-get update

first?

[Nikhil1991]

It seems my proxy was blocking some of Ubuntu's archives. I changed the address and it worked. thanks ppl.