Installation or upgrade should detect if there is an existing service file that isn't/usr/lib/systemd/system/openhab2.service.
Recommended action is to remove anything that isn't the above file. I'm not sure how, but some users have a service file that isn't part of the apt installation that exists in /lib/systemd/system. This is likely due to using rc.init methods which are overridden.
Installation or upgrade should detect if there is an existing service file that isn't
/usr/lib/systemd/system/openhab2.service
.Recommended action is to remove anything that isn't the above file. I'm not sure how, but some users have a service file that isn't part of the apt installation that exists in /lib/systemd/system. This is likely due to using rc.init methods which are overridden.