Boot partition full in Ubuntu Linux

ubuntu_boot_full.sh

#!/bin/sh
# This line check the actual kernels in /boot partition
dpkg --list 'linux-image*'|awk '{ if ($1=="ii") print $2}'|grep -v `uname -r`

# If apt-get refuse to update or purge old kernels do the next
sudo rm -rf /boot/*-3.2.0-{23,45,49,51,52,53,54,55}-*
# Obviously the last line is an example, be careful to check the kernels to delete

# After the delete, execute apt-get install with "force" parameter
sudo apt-get -f install

# If you get the "Could not find the image" purge the kernel image 
sudo apt-get purge linux-image-3.2.0-56-generic


# Execute autoremove to purge the old kernels files
sudo apt-get autoremove

# Finally is recommended execute update and upgrade to be ready for upgrades that may backed up while you discover the /boot partition
sudo apt-get update
sudo apt-get upgrade