Merge branch '1-update-ubuntu-20-04' into 'master'

Resolve "Update Ubuntu 20.04"

Closes #1

See merge request !1
3 jobs for master in 1 minute and 16 seconds (queued for 2 seconds)
Name Stage Failure
build rootfs Build
Hit:3 focal-updates InRelease
Reading package lists...

Multistrap system reported 1 error in /builds/docker/ubuntu/target/.

Cleaning up project directory and file based variables

ERROR: Job failed: command terminated with exit code 1