It looks like your kernel command line might be to blame:
[ 0.000000] Command line: BOOT_IMAGE=/boot/vmlinuz-4.15.0-20-generic
root=UUID=8258f7ec-7593-4407-95b1-cf77cc95da6c ro nogpumanager quiet
splash nouveau.runpm=0 vt.handoff=1
Please:
1. Remove "nogpumanager" and "nouveau.runpm=0" from /etc/default/grub
2. Run: sudo update-grub
3. Reboot
4. Tell us if the problem persists.
** Package changed: xorg (Ubuntu) => ubuntu
** Changed in: ubuntu
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1767228
Title:
Plasma Could Not Correctly Use OpenGL 2 after upgrading to 18.04
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