Hi guys,
I was trying to upgrade my 64 bits ubuntu 18.10 to 19.04. However, When i run "sudo apt update" command on the terminal, I got error messages that seem to suggest there is something wrong with the repository.
Can any one help me what the problem could be?
Thanks in advance!
Code:Hit:1 http://packages.microsoft.com/repos/vscode stable InRelease Ign:2 http://dl.google.com/linux/chrome/deb stable InRelease Hit:3 http://archive.canonical.com/ubuntu cosmic InRelease Ign:4 http://ppa.launchpad.net/aims/sagemath/ubuntu cosmic InRelease Ign:5 http://archive.ubuntu.com/ubuntu cosmic InRelease Get:6 http://dl.google.com/linux/chrome/deb stable Release [943 B] Get:7 http://dl.google.com/linux/chrome/deb stable Release.gpg [819 B] Err:7 http://dl.google.com/linux/chrome/deb stable Release.gpg The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 78BD65473CB3BD13 Ign:8 http://archive.ubuntu.com/ubuntu cosmic-updates InRelease Hit:9 http://ppa.launchpad.net/linuxuprising/java/ubuntu cosmic InRelease Ign:10 http://archive.ubuntu.com/ubuntu cosmic-backports InRelease Ign:11 http://archive.ubuntu.com/ubuntu cosmic-security InRelease Hit:12 http://ppa.launchpad.net/webupd8team/java/ubuntu cosmic InRelease Err:13 http://archive.ubuntu.com/ubuntu cosmic Release 404 Not Found [IP: 91.189.88.24 80] Err:14 http://archive.ubuntu.com/ubuntu cosmic-updates Release 404 Not Found [IP: 91.189.88.24 80] Err:15 http://ppa.launchpad.net/aims/sagemath/ubuntu cosmic Release 404 Not Found [IP: 91.189.95.83 80] Err:16 http://archive.ubuntu.com/ubuntu cosmic-backports Release 404 Not Found [IP: 91.189.88.24 80] Err:17 http://archive.ubuntu.com/ubuntu cosmic-security Release 404 Not Found [IP: 91.189.88.24 80] Reading package lists... Done W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://dl.google.com/linux/chrome/deb stable Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 78BD65473CB3BD13 E: The repository 'http://archive.ubuntu.com/ubuntu cosmic Release' does not have a Release file. N: Updating from such a repository can't be done securely, and is therefore disabled by default. N: See apt-secure(8) manpage for repository creation and user configuration details. E: The repository 'http://archive.ubuntu.com/ubuntu cosmic-updates Release' does not have a Release file. N: Updating from such a repository can't be done securely, and is therefore disabled by default. N: See apt-secure(8) manpage for repository creation and user configuration details. E: The repository 'http://ppa.launchpad.net/aims/sagemath/ubuntu cosmic Release' does not have a Release file. N: Updating from such a repository can't be done securely, and is therefore disabled by default. N: See apt-secure(8) manpage for repository creation and user configuration details. E: The repository 'http://archive.ubuntu.com/ubuntu cosmic-backports Release' does not have a Release file. N: Updating from such a repository can't be done securely, and is therefore disabled by default. N: See apt-secure(8) manpage for repository creation and user configuration details. E: The repository 'http://archive.ubuntu.com/ubuntu cosmic-security Release' does not have a Release file. N: Updating from such a repository can't be done securely, and is therefore disabled by default. N: See apt-secure(8) manpage for repository creation and user configuration details.
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