Final Hi!
As can be seen from the issues reported before, it's _very_ hard for the average or beginning user to diagnose when installation or boot fails.
Therefore (knowing it's bad security and privacy wise) I suggest an addition "blackbox log" debugging aid:
Can't a log be written on the EFI partition (during install or during boot).
Then in theory one could read that log using some common operating system and send them for inspection.
Frustrated,
Ulrich