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 :(
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You received this bug notification because you are a member of Ubuntu-X,
which is subscribed to libdrm in 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
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