Hi Heinrich!
The noble archive for amd64 is currently in a semi-broken state. As an
attempt to mitigate the consequences of CVE-2024-3094, all amd64
binaries built with compromised xz-utils were removed from the archive,
which rendered some packages uninstallable.
If you want a stable archive,
Could it be that something is wrong with Qt's t64 packages? Shouldn't
they replace the non-t64 ones?
$ sudo dpkg -i libqt5widgets5t64_5.15.12+dfsg-3ubuntu6_amd64.deb
Selecting previously unselected package libqt5widgets5t64:amd64.
dpkg: regarding libqt5widgets5t64_5.15.12+dfsg-3ubuntu6_amd64.deb
