Comment 8 for bug 1003185

I've only just got this error too. In my case, I have no networked drives mounted. However, I've got my directories split over an SSD and a spindle HDD. I've been trying to save to /tmp, which is on the SDD, as are most of the "main" files.

If relevant, this is my setup.
SSD
  /
  /home

HDD via fstab
  /home/sparhawk/HDD/

HDD via mount bind:
  /var/tmp
  /var/log
  /var/cache

HDD via symlinks
  /home/sparhawk/.cache
  /home/sparhawk/.mozilla/firefox/[random].default/Cache
  /home/sparhawk/.local/share/Trash