Hi Adrian
P.S. very likely the cause of boot problems is on my side, not installer one.
If I checked partitions with OSX and then with linux, it differs. And the
difference is in my two grub partitions. Using disk tools from different OS
causes some mismatch.
I will reorganize disks, and for Debian will be dedicated one.
Those aren’t boot-related issues, but you’re just missing the firmware for your
graphics card.
Please boot the machine with “nomodeset” and install the
“firmware-graphics-amd” package.
Thanks for advice, I will do this first.
Adrian
Martina