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MY CURRENT VERSION IS 22-04.1 , WHEN I TRY TO INSTALL THE UPDATES FOLLOWING ERRORS ARE SHOWING .

The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 40976EAF437D05B5 NO_PUBKEY 3B4FE6ACC0B21F32
Get:8 http://ci.archive.ubuntu.com/ubuntu xenial-updates InRelease [99.8 kB]    
Hit:9 http://archive.ubuntu.com/ubuntu jammy-security InRelease                             
Err:7 http://security.ubuntu.com/ubuntu xenial-security InRelease                           
  The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 40976EAF437D05B5 NO_PUBKEY 3B4FE6ACC0B21F32
Err:8 http://ci.archive.ubuntu.com/ubuntu xenial-updates InRelease
  The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 40976EAF437D05B5 NO_PUBKEY 3B4FE6ACC0B21F32
Reading package lists... Done
E: The repository 'cdrom://Ubuntu 16.04.1 LTS _Xenial Xerus_ - Release amd64 (20160719) xenial 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.
W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://ci.archive.ubuntu.com/ubuntu xenial InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 40976EAF437D05B5 NO_PUBKEY 3B4FE6ACC0B21F32
W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://security.ubuntu.com/ubuntu xenial-security InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 40976EAF437D05B5 NO_PUBKEY 3B4FE6ACC0B21F32
W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://ci.archive.ubuntu.com/ubuntu xenial-updates InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 40976EAF437D05B5 NO_PUBKEY 3B4FE6ACC0B21F32
sree
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    Your error is pointing towards using Repositories that are long since EOL (End of Life) but your title says that you are using 22.04.1. If you added the 16.04 Repositories to your system I would recommend that you remove them as you will not be able to use those ones at all. If not, please [edit](https://askubuntu.com/posts/1484043/edit) your question and tell us exactly what you are trying to do. Thank you and welcome to AskUbuntu! – Terrance Aug 29 '23 at 14:15
  • Try restoring the default repositories https://askubuntu.com/questions/124017/how-do-i-restore-the-default-repositories – Archisman Panigrahi Aug 29 '23 at 15:52

0 Answers0