I have a similar issue with Windows. The machine already dual-boots Linux, but it is simultaneously demanding Windows 11 and telling me that it doesn't support it. It's a three year old Ryzen, it plays every game I've thrown at it flawlessly - which admittedly is only just so many things, but if it could manage Oblivion Remastered at launch it should manage a bloody operating system surely.

I hear it might be some TPM thing. If so, it still seems like a bad decision to require this thing, and it's telling that I'm working on speculation here - it doesn't _tell_ me that's what it is.