cd /etc/systemd/system/getty.target.wants
rm serial-getty*ttys0
You gotta disable the service by e.g. removing the symlink like shown above. Don't remember the exact name of the symlink in getty.target.wants, so if the rm doesn't work, find out and use the correct name ;). For me disabling the service like that works (you can also try with systemctl disable), but don't blame me, if it doesn't work for you...
bastiand got a reaction from AndrewDB in Le Potato Serial Getty on ttys0 starts, stops restarts