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NO_PUBKEY error when updating 22.0.4

in flag
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
user535733 avatar
cn flag
Why do you have an active 16.04 (`xenial-security`) source in a 22.04 system? Audit your apt sources.
karel avatar
sa flag
Does this answer your question? [How do I restore the default repositories?](https://askubuntu.com/q/124017/)
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Most people don’t grasp that asking a lot of questions unlocks learning and improves interpersonal bonding. In Alison’s studies, for example, though people could accurately recall how many questions had been asked in their conversations, they didn’t intuit the link between questions and liking. Across four studies, in which participants were engaged in conversations themselves or read transcripts of others’ conversations, people tended not to realize that question asking would influence—or had influenced—the level of amity between the conversationalists.