Changes

The original intention was to install a GPU into the Dbase server, as GPU compute tasks wouldn't interfere (much) with the main operation of the server. The problem seems to be a combination of an unsigned Nvidia driver, Ubuntu 18.04, UEFI, and Secureboot (or not). See https://medium.com/@nolanmudge/installing-an-nvidia-graphics-driver-with-a-ubuntu-14-04-and-up-efi-boot-52725dd6927c

See what drivers are being used