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!
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https://bugs.launchpad.net/bugs/1757202
Title:
xubuntu / bionic / nvidia-driver-390 can only be used by one user at a
time
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