Hello,
I had got same problem. My host is similar like your - an Lattepanda (x5-Z8350/4G/64GB)
The solution was this in my case:
- I downloaded the Univention 4.1-0 (or below/lower) (grub-1.9x). The reason -> 4.1-1 (grub-2.x) and above/higher versions weren’t able to boot (I got the message: error: variable `prefix´ isn´t set.)
- I installed the Univention 4.1-0. Important: In the last step of the installation you allow that the installer dowloads the updates! (It is patched the system at 4.1-5) If you unchecked the download updates checkbox the installer had finished the installation but after I couldn’t login into the web management neither as ‘Administror’ nor ‘root’. SSH was OK. I got some kind of DBUS error.
- When the installation finished (4.1-5), I entered into the management console as ‘root’ and updated my system to the latest version (4.2-3)
- After I login as ‘Administrator’ and registered my system (I uploaded my license)
At now my system looks like is OK - I have got this bug (System-Fehlerdiagnose Überprüfe Gültigkeit der SSL Zertifikate) but otherwise everthing works in neatly.
I hope this helps you
(sorry for my English)