http://askubuntu.com/questions/289869/ubuntu-12-10-i-cant-clean-up-space-in-boot-directory
It's probably because you have too many kernel packages installed (you can only run one at a time).
Check which kernel packages are installed:
dpkg -l 'linux-image*' | grep '^ii'
Check what your current kernel is:
uname -r
% ls -al /boot
And my currently running kernel is:
% uname -r
3.5.0-27-generic
Thus, in my case I could free up space in /boot by removing:
linux-image-3.5.0-26-generic
linux-image-3.5.0-28-generic
by running apt-get remove <package_name>
You can remove ALL the old kernels, and keep just the latest one. This will free up space on Refer this link. User mikewhatever has provided an answer which can do this removal from one single command from command line. Update: listing the command here itself, from the said link:
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