FYI.... maybe its the same for coming 1.0 didnt check on 1.x
If you install OMV on a hdd which had already some system then you can get stuck on "cannot find root..."
Happened to me with a ssd where i had a guid table before.
Solution: install without the kickstart script, then the debian installer asks for replacement of the guid table. After this also a standard install works flawless.
Sorry i cannot provide more exact informations, its out of my memory from a few days ago