The installation guide:
https://github.com/SickChill/SickChill/wiki/SickChill-installation-Ubuntu-15
doesn't work anymore.
Running (as recommended):
curl https://raw.githubusercontent.com/SickChill/SickChill/master/contrib/debian-ubuntu-install.sh | sudo bash
immediately produces this screen:

The computer in question has a vanilla Ubuntu 20.04 server installed:
$ python -V
Python 2.7.18rc1
$ python3 -V
Python 3.8.2
Additionally, it would be nice to have a small guide on the recommended way to update SickChill from python2 to python3 version.
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Considering that guide is for Ubuntu 15.04 that is expected.
Thank you for your prompt answer!
https://github.com/SickChill/SickChill/wiki/SickChill-installation-Ubuntu-15#otherwise
Specifically, Step 4 copies /opt/sickchill/runscripts/init.systemd, which is not there.
fixed