Hi Chris, once more ..
> > Does the initrd on this system contain? > > /usr/lib/udev/rules.d/64-btrfs.rules No, it didn't. Now I added it, and with 64-btrfs.rules available in the initrd I still get the same error (see previous screenshot) :-( Best Norbert -- PREINING Norbert https://www.preining.info Fujitsu Research Labs + IFMGA Guide + TU Wien + TeX Live + Debian Dev GPG: 0x860CDC13 fp: F7D8 A928 26E3 16A1 9FA0 ACF0 6CAC A448 860C DC13
