dpkg --get-selections | \
  grep 'linux-image*' | \
  awk '{print $1}' | \
  egrep -v "linux-image-$(uname -r)|linux-image-generic" | \
  while read n
  do
    apt-get -y remove $n
  done

http://ubuntuforums.org/showthread.php?t=1435818

Snippet found on forums to clean up /boot when too many kernels are installed. Though I think the script may need tweaking. Use at own risk!

Remove Old Kernel Versions

linux

Bash