I have a multi disk system with Win 11 (update channel) and Ubuntu 21.04. When I built the PC & installed the software I did it the old fashioned way and selected CSM in the MSI BIOS. In hindsight, this was not a Good Idea. It's bitten me on the arse as the weekly update of Win has caused shenanigans, insisting on secure boot and TPM. TPM is easy but if I enable UEFI it just boots to the BIOS. I was able to use Win 11 until this last update. I can trick Win into a limited functionality by reverting to a restore point. Both disks are backed up to another drive using Back In Time via Ubuntu. I've been looking for some sort of tutorial but I think I might have to do a complete reinstall of both OS's. Any workarounds available???