Now I can confirm, applying the patch mentioned above brings my PC back to normal.
Short summary for everyone else who might read this bug report: Download and save patch as patch.diff and run: sudo apt-build install --patch patch.diff libgl1-mesa-dri -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to mesa in Ubuntu. https://bugs.launchpad.net/bugs/1915870 Title: gnome session not starting (segfault with r300_dri.so) Status in Mesa: Unknown Status in mesa package in Ubuntu: Confirmed Status in mesa package in Fedora: Unknown Bug description: Graphical user interface is not coming up upon start. Only SSH is possible. lsb_release -rd: Description: Ubuntu 20.10 Release: 20.10 dmesg: [ 11.985343] gnome-session-c[1013]: segfault at 0 ip 0000000000000000 sp 00007fff7679ca48 error 14 in gnome-session-check-accelerated-gl-helper[56020e238000+2000] [ 11.985352] Code: Unable to access opcode bytes at RIP 0xffffffffffffffd6. [ 14.216117] gnome-shell[1094]: segfault at 0 ip 0000000000000000 sp 00007ffeddff9f88 error 14 [ 14.216122] Code: Unable to access opcode bytes at RIP 0xffffffffffffffd6. [ 15.316292] gnome-shell[1109]: segfault at 0 ip 0000000000000000 sp 00007ffc70716198 error 14 [ 15.316297] Code: Unable to access opcode bytes at RIP 0xffffffffffffffd6. apt-cache policy: gnome-session: Installed: (none) Candidate: 3.38.0-1ubuntu1 Version table: 3.38.0-1ubuntu1 500 500 http://de.archive.ubuntu.com/ubuntu groovy/main amd64 Packages 500 http://de.archive.ubuntu.com/ubuntu groovy/main i386 Packages gnome-session-bin: Installed: 3.38.0-1ubuntu1 Candidate: 3.38.0-1ubuntu1 Version table: *** 3.38.0-1ubuntu1 500 500 http://de.archive.ubuntu.com/ubuntu groovy/main amd64 Packages 100 /var/lib/dpkg/status gnome-session-common: Installed: 3.38.0-1ubuntu1 Candidate: 3.38.0-1ubuntu1 Version table: *** 3.38.0-1ubuntu1 500 500 http://de.archive.ubuntu.com/ubuntu groovy/main amd64 Packages 500 http://de.archive.ubuntu.com/ubuntu groovy/main i386 Packages 100 /var/lib/dpkg/status /var/crash: see attachment To manage notifications about this bug go to: https://bugs.launchpad.net/mesa/+bug/1915870/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
