Could you please update title to reflect OS where you install NVM?
Could you please update description with the list of changes and mention initial issue?

/azp run ubuntu1604, ubuntu1804

Hi! How is this supposed to work? I tried this with this miniature workflow and it didn't:

name: nvm
on:
  push:
jobs:
  nvm:
    runs-on: ubuntu-latest
    steps:
      - name: try out nvm
        run: nvm install

@boredland , please don't forget shell params:
shell: bash -l {0}

-l Make bash act as if it had been invoked as a login shell (see INVOCATION below).
--login
files ~/.bash_profile, ~/.bash_login, or ~/.profile. By default, bash reads these files when it is
invoked as a login shell (see INVOCATION below).