> mainly because it's (also) a rescue system where you usually don't wont such
automagic to take place

That is why i used the UUID, which is a second partition on my USB-drive and not
/dev/sdX.

> You could try mounting with boot option 'services=mountall.sh'
> Does this provide what you're searching for?

Sounds like a good solution, thanks!

regards,
Lukas