[anthk]

Uhm, I use Mate under Trisquel 11 (bound to Ubuntu 22 releases, but libre), it's the default desktop DE and I have no issues with neither qt5ct nor GTK theme overriding, which is more apt for Gnome3/OSTree based desktops than normal setups.

[Joel_Mckay]

This issue appeared in Canonical's Ubuntu 24.04.1 Noble Numbat MATE Desktop iso and universe repository meta packages ubuntu-mate-desktop and mate-desktop .

The meta package ubuntucinnamon-desktop does not seem to impact the Qt5 Apps/installation in a detrimental way.

If I could offer any advice about this mystery issue... probably wiser to defer upgrading for a bit =3