Im not being able to run update manager as I get the error saying that there is not enough free space in the /tmp directory. I've practically cleaned out the tmp directory but the error persists.

Any help would be appreciated. here's df-h

/dev/loop0       13G   11G  952M  92% /
udev            2.0G  4.0K  2.0G   1% /dev
tmpfs           785M  920K  784M   1% /run
none            5.0M     0  5.0M   0% /run/lock
none            2.0G  584K  2.0G   1% /run/shm
/dev/sda6        20G   14G  6.4G  68% /host

overflow        1.0M   16K 1008K   2% /tmp

Thanks.