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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
karel
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sree
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    Why do you have an active 16.04 (`xenial-security`) source in a 22.04 system? Audit your apt sources. – user535733 Aug 09 '23 at 16:48
  • Does this answer your question? [How do I restore the default repositories?](https://askubuntu.com/q/124017/) – karel Aug 12 '23 at 07:20

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