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.

The Linux command line is a text interface to your computer. Also known as shell, terminal, console, command prompts and many others, is a computer program intended to interpret commands. Allows users ...

The second option for 2.4.20 is not showing up on the grub menu. If I go to the grub command prompt, the vmlinuz-2.4.20 doesn't show up when running "kernel /boot/<TAB>" even though it is under /boot.