Unit pritunl.service not found
line 223: pritunl: command not found
Solution-
sudo apt reinstall pritunl -y

sudo systemctl enable pritunl
sudo systemctl start pritunl

If Systemd Daemon reload issue
Try :
sudo systemctl daemon-reload
sudo systemctl restart pritunl

Error chk log :

sudo journalctl -u pritunl --no-pager -n 50

Pull request @samsesh

Ajith.kp -forked
https://github.com/wger-project/flutter

Update?