All that's happening here is that APT is doing some basic signature checking and refusing to update from an unsigned repository.
Note that, from your output:
This would seem to suggest that the repository itself is not signed and you may need to tinker with the settings for apt. But you might just need to replace the key with a fresh copy.
Another potential possibility is that they have update their signing key and your install media has an out of date key.
I believe the message prefix signify the following: W - Warning, E - Error, and N - Note.
P.S.
Just did a little digging for the sake of curiosity:
InRelease package list with in-line GPG signing
Release package list without GPG signing, which means you'd need to also pickup the corresponding Release.gpg to do the signature check.'
https://unix.stackexchange.com/questions...e-refer-to
https://wiki.debian.org/DebianRepository/Format
Note that, from your output:
Quote:E: The repository 'http://la.mxrepo.com/antix/bookworm bookworm InRelease' is not signed.
This would seem to suggest that the repository itself is not signed and you may need to tinker with the settings for apt. But you might just need to replace the key with a fresh copy.
Another potential possibility is that they have update their signing key and your install media has an out of date key.
I believe the message prefix signify the following: W - Warning, E - Error, and N - Note.
P.S.
Just did a little digging for the sake of curiosity:
InRelease package list with in-line GPG signing
Release package list without GPG signing, which means you'd need to also pickup the corresponding Release.gpg to do the signature check.'
https://unix.stackexchange.com/questions...e-refer-to
https://wiki.debian.org/DebianRepository/Format