u-m can't update the packages it show as upgradable and it doesn't show an error message,only that it can't calculate total download size. But if you start it in a terminal, it displays this on stdout:
Code:
Gtk-Message: 06:04:03.332: Failed to load module "appmenu-gtk-module"
/usr/lib/python3/dist-packages/gi/overrides/Gtk.py:1689: Warning: g_atomic_ref_count_dec: assertion 'old_value > 0' failed
return _Gtk_main(*args, **kwargs)
required_download could not be calculated: E:Can't find a source to download version '23.04.3' of 'ubuntu-settings:amd64'
required_download could not be calculated: E:Can't find a source to download version '23.04.3' of 'ubuntu-settings:amd64'
required_download could not be calculated: E:Can't find a source to download version '23.04.3' of 'ubuntu-settings:amd64'
WARNING:root:directory '/var/lib/ubuntu-advantage/apt-esm/var/cache/apt/archives' does not exists
ERROR:root:free space check failed
Traceback (most recent call last):
File "/usr/lib/python3/dist-packages/UpdateManager/UpdatesAvailable.py", line 921, in on_button_install_clicked
self.cache.checkFreeSpace()
File "/usr/lib/python3/dist-packages/DistUpgrade/DistUpgradeCache.py", line 1192, in checkFreeSpace
for (dir, size) in [(archivedir, self.required_download),
^^^^^^^^^^^^^^^^^^^^^^
File "/usr/lib/python3/dist-packages/UpdateManager/Core/MyCache.py", line 146, in required_download
pm.get_archives(fetcher, self._list, self._records)
apt_pkg.Error: E:Can't find a source to download version '23.04.3' of 'ubuntu-settings:amd64'Synaptic still works and I kept one package, ubuntu-settings, left in order to get an readable output compared to the wall of text it usually put out.