In the log "apt-upgrade-libdrm2-no-gnuplot", gnuplot has been entirely uninstalled :(
As for libgl1-mesa-dri : $ apt-cache policy libgl1-mesa-dri libgl1-mesa-dri: Installed: 19.0.2-1ubuntu1.1~18.04.1 Candidate: 19.0.2-1ubuntu1.1~18.04.1 Version table: *** 19.0.2-1ubuntu1.1~18.04.1 500 500 http://fr.archive.ubuntu.com/ubuntu bionic-proposed/main amd64 Packages 100 /var/lib/dpkg/status 18.2.8-0ubuntu0~18.04.2 500 500 http://fr.archive.ubuntu.com/ubuntu bionic-updates/main amd64 Packages 18.0.0~rc5-1ubuntu1 500 500 http://fr.archive.ubuntu.com/ubuntu bionic/main amd64 Packages So it seems it also comes from proposed (last upgraded on 2019-06-07, previously on 2019-05-10). It's unfortunate that you can't reproduce what I have here :( -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1829872 Title: No more desktop effects since libdrm upgrade in Bionic To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/libdrm/+bug/1829872/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs