You will have to reinstall the OS, and redo the partition table (256 MB boot partition (that’s enough for a single OS), 2 GB swap, and the rest / root partition). Then install Debian with XFce on the / partition. You use it normally as with any other Debian-based OS, that Zorin is also one of them, but you use the terminal to update the system. It’s very usable.



Just install a distro that doesn’t fail like that by overwriting system files on a whim. You’re saying that you’re going from an arch based system (which are prone to get weird errors every few weeks), to NixOS, which has at the very least a steep learning curve. My assessment is that you are asking for trouble yourself. I know that Debian-stable sounds boring, but it never breaks like that. If you’re truly burnt out as you say, you would go with the safe, unglamorous solution. I used to tinker with Linux all the time (I started on slackware in 1998), now I just run Mint on laptops, and Debian on my PCs. I just don’t want bad surprises anymore, I’m at an age that the OS needs to work as expected.