Try installing another version of Ubuntu on a PC that already has Windows and Ubuntu.
http://ftp.riken.go.jp/Linux/ubuntu-releases/18.04.5/ DL from RIKEN.
Enter with F12 at startup. Select USB.
I wanted to coexist with the existing OS, so select "Other". Creating a partition is a hassle. Reference: http://lab.cntl.kyutech.ac.jp/~nishida/sphinx/post/2015.08.28-dualboot-ubuntu.html
The following three are created.
Select the created "efi" as the device to install.
GTX1080 should be installed, but it is not recognized. https://qiita.com/yto1292/items/463e054943f3076f36cc It will be recognized when the CUDA driver is installed.
$ sudo apt-get install cuda-drivers