Comment 90 for bug 269215

I ran into the same problem. I had mounted /tmp as a tmpfs for a while but decided I needed the memory so I didn't mount it any more (just commented out the line in fstab.) However, the /tmp mount point had mode 0755 (drwxr-xr-x) which caused this behavior because various tools couldn't create their temp files.
A
sudo chmod 1777 /tmp
and a reboot fixed it.