Impossible to install Etherpad

From App center, install of Etherpad Version 1.6.6 fail. I don’t know why, it just fail.
where are the log ? What should I do ?

ok, logs are in /var/log/univention/appcenter.log

it looks like it is a problem of join AD, I will retry with another Administrator account.

OK this looks to be the right path.
I suggest that UNIVENTION staff make some more check on the profile that try to install an APP in the app center. It is not enought to be admin to install some APP, it is required for some App to be Antreprise admin, or Ldapadmin.