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.
On many Linux systems the boot process sees the usual BIOS screen, followed by Grub. The Grand Unified Bootloader (Grub) takes over from our BIOS and offers the user a choice of OS options and kernel ...