I found an amazing looking post on a blog somewhere. Lost it.
It was on about the version of flatpak on the Librem 5 being years out of date, and having a known bug that leaked storage, meaning you ran out of storage as you used it. I’m pretty sure this has happened to me. My Librem 5 is full.
The solution on there was to install a version from a newer Debian, manually clean up a few files, and bingo.
Does anyone know where I can find these instructions?