I managed to install Rocky 9 on Mac mini 2011.
Works like charm, and it’s fast, I love it.
First I prepared partitions on clean disk with fdisk, and in destination settings, selected “Do not install boot loader” did not create new partitions just reformated existing ones, and proceeded with MINIMAL installation.
Once installation finished rebooted still with USB-DVD.iso in rescue mode and ran: grub2-mkinstall in “chroot” environment. Added groupinstall “Server with GUI” after and voila.
All good. Now just to make Wifi working and other little things.
It was easier than I expected. I have a Very! nice machine that was sitting and catching the dust already for years.