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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
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xenial-security) source in a 22.04 system? Audit your apt sources. – user535733 Aug 09 '23 at 16:48