Ah, I see what's going on here. You only have this in your sources.list:
deb http://archive.ubuntu.com/ubuntu mantic universe restricted
multiverse main
In particular, you don't have mantic-updates enabled. I am not surprised
your upgrade failed. Please enable mantic-updates and try again.
This also explains the UI issue, because you have an out-of-date distro-
info-data, so it doesn't have the info for 24.04.
** Changed in: ubuntu-release-upgrader (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/2061126
Title:
Upgrade to 24.04 beta fails
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