Hi.. I'm currently back on macOS but ran Ubuntu 20.04 on my iMac for ~4 months exclusively. As in no macOS install at all. Purely Ubuntu. At least once a month, my boot disk would revert to read only.

Did that and now all I do is boot to a GRUB prompt with limited commands. Although, I moved up from blue screens no matter what I chose to boot to, now I am not sure what is happening. It was WHS 2011 ...