@Neotheta Full root partition is really a problem I meet often, and it's unfortunately really difficult to troubleshot remotely family on Linux. It's a grave issue. I can blame:
- The installer: proposing sometime a too small root partition by default for nowadays usage.
- Kernel update and keeping old kernel is a thing yes!
- But number one on my list: Flatpak. It already drowned 3 family computer here. Had to chroot them from a gparted iso...
$ du -h /var/lib/flatpak
12G /var/lib/flatpak