There's a lot of information in that log. One possible reason for this bug I can see is:
Feb 25 11:06:55 tjcw-Standard-PC-i440FX-PIIX-1996 /usr/lib/gdm3/gdm-x-session[882]: (WW) qxl(0): drmSetMaster failed: Permission denied ... Feb 25 11:06:55 tjcw-Standard-PC-i440FX-PIIX-1996 /usr/lib/gdm3/gdm-x-session[882]: (EE) systemd-logind: failed to take device /dev/dri/card0: Operation not permitted Feb 25 11:06:55 tjcw-Standard-PC-i440FX-PIIX-1996 /usr/lib/gdm3/gdm-x-session[882]: (EE) /dev/dri/card0: failed to set DRM interface version 1.4: Permission denied This means there's some kind of incompatibility between the qxl Xorg driver and the kernel. Indeed that would only be a problem for virtual machines. ** Package changed: xorg (Ubuntu) => xserver-xorg-video-qxl (Ubuntu) ** Also affects: linux (Ubuntu) Importance: Undecided Status: New ** Summary changed: - I get logged out immediately after login to an X session + I get logged out immediately after login to an X session (QXL Xorg driver on kernel 5.4) -- 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 (QXL Xorg driver on kernel 5.4) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+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