Just a quick note to my self

We mostly want to run LTS-versions only, of Ubuntu.

In case you absolutely need to update, in between LTS-versions, this is how it’s done:

Ubuntu 18.04 upgrade to Ubuntu 19.04 (not LTS)

nano /etc/update-manager/release-upgrades

-> Prompt=normal

sudo apt update && sudo apt dist-upgrade -y

sudo do-release-upgrade