I just had this problem on a Mint-19.3 XFCE upgraded from 18.3. For me, the fix was:
* `sudo nvidia-xconfig` * `sudo vi /etc/X11/xorg.conf` The 'Section "Files"..EndSection' block already existed but was empty. I added this: Section "Files" ModulePath "/usr/lib/nvidia-340/xorg" ModulePath "/usr/lib/xorg/modules" EndSection * Then `sudo systemctl restart lightdm.service` which logged me out of my sessions! -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to nvidia-graphics-drivers-390 in Ubuntu. https://bugs.launchpad.net/bugs/1757202 Title: xubuntu / bionic / nvidia-driver-390 can only be used by one user at a time To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/nvidia-graphics-drivers-390/+bug/1757202/+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