Hi,
We just released a new Kolibri build for 0.9.1 on our PPA last week. The main update for the new release is to add python3-distutils as a requirement for installing kolibri to resolve the issue in Failing to Install on Lubuntu 18.04. Could you please try sudo apt-get install python3-distutils and then run sudo apt-get install kolibri again? Thank you so much!
Sincerely,
Lingyi