I’ve got an issue with my var/tmp/ folder. This folder get datas very fast. More or less 5 Gb in one Day. I had to delete the content manually to make regular udates of Ubuntu Mate, because /directory was full.
Hey, Atreju. It’s hard to say what may be causing that folder to fill up so quickly without looking at it. Try outputting that directory with the ls -l command. This would give you a better idea of what those files are and where it is coming from. Hope this helps.