So in BIOS I've tried all 3 combos - Intel, Nvidia and Optimus. Does not change anything.
I boot from USB stick with the minimal netinstall. I get the menu. Both Graphical and non-graphical install instantly give me a black 1cm strip on top of my screen. Where I can see 2 blue dots. Or occasionally lots of multicolored dots.
So I assume this is a UI-driver issue. Try to edit the grub to include
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nomodeset nouveau.modeset=0
but that did not change anything.
I have problems debugging this since
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You can access this console by pressing Left Alt+F4 (hold the left Alt key while pressing the F4 function key); get back to the main installer process with Left Alt+F1. These messages can also be found in /var/log/syslog . After installation, this log is copied to /var/log/installer/syslog on your new system.
this does not work so I cannot check the log.
Basically I'm stuck.
It's an old laptop for a hobby project so no biggie. But I really would like to learn how to debug and work around this issue.