The first command fails with a huge error again.
omv-regen throws "command not found" right after its installation.
Give me a few days to consider my next steps.
Will probably lead me to a new installation, the system seems pretty damaged.
Not the best initial position to face problems in the future.
Mostly unsatisfying because I didn't do anything outside of the omv GUI after its installation.
Thank you so far for your great support!