update for Ubuntu 22.04?

[alexmyczko]

will you update the docs for the new 18.04 LTS?

also the ubuntu 18.04 slurm version is not the latest and a simple backport from sid builds fine.

cuda-10 and nvidia-410 with self built tensorflow works great too (needs bazel)

[nateGeorge]

I'm working on instructions for Ubuntu 18. It's almost the same as 16. Will update here when it's ready.

[nateGeorge]

Here are my instructions for the cluster I built: https://github.com/nateGeorge/slurm_gpu_ubuntu. Some things still seem a little off (doesn't seem robust upon restarts for some reason, some weird debug-level-3/4 messages about cgroups in the logs), but it works. I'm able to schedule GPU jobs which run on all the GPUs in the cluster which was the goal.