Go to the parent directory in Files/Nautilus Ubuntu 12.10
Solution 1:
From this answer : Nautilus stopped working after update to 3.6.1
Both Ubuntu versions 12.04 and 12.10 use the nautilus 3.4.2. Therefore this (nautilus 3.6.1) can be considered as an "unsupported" version.
Some PPAs updates-upgrades essential system packages and this can result in a very frustrating experience.
To solve your problem open a terminal and remove the ppa with bellow commands
sudo apt-get install ppa-purge sudo ppa-purge ppa:gnome3-team/gnome3 sudo apt-get update sudo apt-get dist-upgrade