Comment 15 for bug 2055720

Thanks. A few more things:

1. Were you still using /etc/apt/sources.list before the upgrade? Or were you an early deb822 adopter (i.e. already using /etc/apt/sources.list.d/ubuntu.sources)?
2. Do you have /etc/apt/sources.list.distUpgrade? If so, can you share that please?
3. Can you please attach the resulting /etc/apt/sources.list.d/ubuntu.sources?

According to the log, you have no valid mirrors configured, so u-r-u goes ahead and generates some default sources (which does not include universe -- that is a bug in itself IMO):

2024-03-01 09:25:39,054 DEBUG updateSourcesList()
2024-03-01 09:25:49,077 DEBUG rewriteSourcesList() with mirror_check
2024-03-01 09:25:49,077 WARNING mirror check skipped, *overriden* via config
2024-03-01 09:25:49,078 DEBUG examining: 'deb [arch=amd64,arm64,armhf] http://packages.microsoft.com/repos/code stable main'
2024-03-01 09:25:49,078 ERROR No valid mirror found
2024-03-01 09:26:04,429 DEBUG rewriteSourcesList()
2024-03-01 09:26:04,430 WARNING mirror check skipped, *overriden* via config
2024-03-01 09:26:04,430 DEBUG examining: 'deb [arch=amd64,arm64,armhf] http://packages.microsoft.com/repos/code stable main'
2024-03-01 09:26:12,205 INFO Generated new default sources.list

What's odd is that it appears that u-r-u only looked at /etc/apt/sources.list.d/vscode.list.