Hello OMVs!
I managed to fix my OMV installation. It took a while to figure it out...
I ran into the avahi service configuring the local network behavior.for somewhat reason it was us full to delete the entry for using IPv6 within the configuration file for this service.
A reboot then resulted in a filled /etc/networks/interfaces file - I then again deleted all entries about IPv6 and voila...omv was at least booting so I could login in the consoles.
I then tried to call omv-firstaid, which was working but setting up the network interface failed due to a not startet monit-service. Had to fix some stuff there, then could setup the interface with first aid consol.
Took me around 4h to figure this stuff out. A pain as some might guess.
Maybe someone could explain in more detail what might have caused this error.
Cheeres and happy weekend!