sudo dpkg --configure -a
sudo apt-get autoclean
df -i
dpkg -l linux-headers-\* linux-image-\* | grep ^ii
sudo dpkg --remove linux-headers-3.8.0-18
sudo -i
sudo apt-get purge linux-image-x.x.x.x-generic
sudo apt-get purge linux-image-3.2.0-3{0..5}-generic (removes 30,31,..,35)
sudo update-grub2
http://askubuntu.com/questions/317763/apt-get-no-space-left-on-device-12-04