How to install previous Version of an app
Step 1
You will need the AppID to install an app. In case you do not know the AppID you can list available apps with their IDs.
root@ucs:~# univention-app list --ids-only
[...]
dudle
egroupware
etherpad-lite
fetchmail
filewave
[...]
Step 2
List available version of the app in question by using the AppID from above:
# univention-app list <APPID>
root@ucs:~# univention-app list etherpad-lite
etherpad-lite
Name: Etherpad
Versions:
1.6.6
1.6.0
Step 3
Install the desired version:
# univention-app install <APPID>=<VERSION>
root@ucs:~# univention-app install etherpad-lite=1.6.0