Hey, semitones , I literally just did the same thing. It's been quite a morning to say the least......
After some due frustration this is what I did to solve my broken OMV and get running again:
as expected, this didnt work for me. Mis-configured packages....
Next, I followed these commands:
ET VIOLA!!! After a healthy reboot, my OMV once again opens at its IP address in a browser.