NixOS user here! Fedora is a very good contender as well

One from a fellow student, who didn’t know about fork bombs and put one in his .bashrc, following “advice” from a friend, he never figured out how to fix it and just reinstalled

On my part, it was a server install of YunoHost that I broke by trying to setup an app to use the LDAP provider. Since I needed the YunoHost LDAP password, I messed with some files, broke the LDAP config, but it turns out everything in YunoHost uses LDAP. Including your own user and its associated privileges. So the server was entirely broken, and it was impossible to restore backups because the YunoHost restore tool was also botched by the config errors

I tried dual-booting Manjaro from my Ubuntu install, since VMs were slow on my machine at the time and I wanted to give Manjaro a try.

Manjaro wouldn’t boot (X11 sessions crashes on boot), and then when I returned to Ubuntu, I got dropped straight to the GRUB rescue shell because I had shrunk the partition from the Manjaro installer, and it had fucked up the Ubuntu install :/ so instead of two OSes I had none

For Flatpak apps, along with Warehouse, Flatseal allows you to view and edit permissions for each app, which is not only useful but sometimes mandatory when an app has misconfigured permissions