In this @debian install, I didn't do encrypted LVM, or LVM at all. I went for straight partitions, one for swap, one for /. I'm changing my philosophy on partitioning. #KeepItSimple
I installed Debian Buster on a mid-2011 iMac. I went for a dual boot with MacOS, using the REFInd boot manager to make it slightly more civilized. I used the nonfree-firmware Debian installer but still had to add firmware to get the Radeon card to work. #FunWithRunLevel3
Unless I'm incorrect, @debian Live images used to all ship with nonfree firmware, but now they don't, though live images with nonfree firmware are available in the nonfree "area"