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