Cool Solution - Let's Encrypt
From Univention Wiki
The Let's Encrypt solution is now available in the Univention App Center.
A guide to migrate to the mentioned App can be found below, if Let's Encrypt has been installed through the Cool Solution.
Migrating to the Let's Encrypt App
This cool solution has been released as an app for the Univention App Center.
To migrate to the Let's Encrypt app, simply uninstall the Cool Solution package. Existing host or domain keys below
/etc/univention/letsencrypt/ won't be removed and will be used by the app later.
Afterwards, install the app from the App Center in the UMC on your server and configure it, as explained in the readme that's being displayed after installation.