ubuntu apt-get update boot no space left on device

gistfile1.txt

sudo apt-get update
sudo apt-get upgrade
dpkg -l linux-image-\* | grep ^ii
kernelver=$(uname -r | sed -r 's/-[a-z]+//')
echo $kernelver
dpkg -l linux-{image,headers}-"[0-9]*" | awk '/ii/{print $2}' | grep -ve $kernelver
sudo apt-get purge linux-image-3.13.0-{34,35,36,37,40}
sudo apt-get purge linux-headers-3.13.0-{34,35,36,37,40}