Created attachment 710128 [details]
/var/log/ contents in case there is no video at all
As I was not happy with the provided logs in the previous update, I did another
attempt with no boot parameters (result no video).
Attached are all log files in /var/log, it looks better this time.
Still wunder, why does it all work well when the video mode is specified and
the installation fails when the video mode is not specified??