"mkdtemp: private socket dir: No space left on device."

Couldnt boot into X windows due to a disk space error.

Arun Prabha had some useful terminal commands, like:

df -l
du -hc –max-depth=1

I had 10G in /tmp/backup_tmp_yvH4rLRM/tmp/ ...whats going on there? Sounds like an auto-backup ran out of control. Probably tried to backup /mnt/video/ and /mnt/win/ ...yep, that was it. Should be better next time.