Public bug reported:

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

** Affects: gnome-session (Ubuntu)
     Importance: Undecided
         Status: New

** Attachment added: 
"_usr_libexec_gnome-session-check-accelerated-gl-helper.126.crash"
   
https://bugs.launchpad.net/bugs/1915870/+attachment/5464194/+files/_usr_libexec_gnome-session-check-accelerated-gl-helper.126.crash

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https://bugs.launchpad.net/bugs/1915870

Title:
  gnome session not starting

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