Here is the output from 'journalctl'. I think it shows X11 taking a SIGABRT (signal 6) but I cannot find any X11 log files in /var/log . My next tack will be to try installing a new version of ubuntu 20.04 .
** Attachment added: "Output of 'journalctl' on the affected virtual machine" https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1864644/+attachment/5330866/+files/jc.log -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xorg in Ubuntu. https://bugs.launchpad.net/bugs/1864644 Title: I get logged out immediately after login to an X session To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1864644/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp