Assuming this information is correct, OP wants to check a file called similarly to jellyfin.list in /etc/apt/sources.d/ and replace the word circe with noble (for the Ubuntu 24.04 codename) or trixie (if noble gives the same error as circe). Keep in mind you need sudo/root privileges to modify this file.
I've just checked and apparently I only use first-party plugins, so I'd probably not have any issues. I'll still delay the 10.11 update for the other reason I mentioned.
I think I'll add an exception to watchtower, so my Jellyfin image doesn't get updated to the full release when it comes out. I'm really fond of my plugins and the fact that the "seen" status doesn't change when replacing the underlying video file.
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This is correct, but it doesn't require manual intervention by the user.