Problem
You postgreSQL complains about a missing locale:
OperationalError: FATAL: Datenbank-Locale ist inkompatibel mit Betriebssystem
DETAIL: Die Datenbank wurde mit LC_COLLATE »de_AT.UTF-8« initialisiert, was von setlocale() nicht erkannt wird.
Environment
The database originally was installed with “de_AT.UTF-8” which is bot available to the operating system.
Your UCR varaibles are set as shown:
root@ucs:~# ucr search --brief locale
kopano/cfg/admin/default_store_locale: de_AT.UTF-8
locale/default: de_DE.UTF-8:UTF-8
locale: de_DE.UTF-8:UTF-8 en_US.UTF-8:UTF-8
Solution
For some reason the locale package did not get installed properly. Install the package as follwos and the database should run fine from then on.
root@ucs:~# ucr set locale="en_US.UTF-8:UTF-8 de_DE.UTF-8:UTF-8 de_AT.UTF-8:UTF-8"
root@ucs:~# dpkg-reconfigure locales