Ubuntuで最新のカーネル以外をアンインストールする ref: http://qiita.com/poad1010/items/388d6a020624a0c059c8

file0.sh

dpkg --list | grep -E -o "linux-image-[0-9]+\.[0-9]+\.[0-9]+-[0-9]+-generic"

file1.txt

$ dpkg --list | grep -E -o "linux-image-[0-9]+\.[0-9]+\.[0-9]+-[0-9]+-generic"
linux-image-4.8.0-36-generic
linux-image-4.8.0-51-generic

file2.sh

dpkg --list | grep -E -o "linux-image-[0-9]+\.[0-9]+\.[0-9]+-[0-9]+-generic" | grep -o -E "[0-9]+\.[0-9]+\.[0-9]+-[0-9]+" | uniq

file3.txt

$ dpkg --list | grep -E -o "linux-image-[0-9]+\.[0-9]+\.[0-9]+-[0-9]+-generic" | grep -o -E "[0-9]+\.[0-9]+\.[0-9]+-[0-9]+" | uniq
4.8.0-36
4.8.0-51

file4.sh

dpkg --list | grep -E -o "linux-image-[0-9]+\.[0-9]+\.[0-9]+-[0-9]+-generic" | grep -o -E "[0-9]+\.[0-9]+\.[0-9]+-[0-9]+" | uniq | sort -n -r | head -1

file5.txt

$ dpkg --list | grep -E -o "linux-image-[0-9]+\.[0-9]+\.[0-9]+-[0-9]+-generic" | grep -o -E "[0-9]+\.[0-9]+\.[0-9]+-[0-9]+" | uniq | sort -n -r | head -1
4.8.0-51

file6.txt

dpkg --list | grep -E -o "linux-image-[0-9]+\.[0-9]+\.[0-9]+-[0-9]+-generic" | grep -o -E "[0-9]+\.[0-9]+\.[0-9]+-[0-9]+" | uniq |
$(dpkg --list | grep -E -o "linux-image-[0-9]+\.[0-9]+\.[0-9]+-[0-9]+-generic" | grep -o -E "[0-9]+\.[0-9]+\.[0-9]+-[0-9]+" | uniq | sort -n -r | head -1)

file7.txt

apt autoremove --purge -y linux-headers-<上記までで抽出した最新以外のバージョン>*
apt autoremove --purge -y linux-image-<上記までで抽出した最新以外のバージョン>*

file8.sh

USER=$(whoami)

if [ ! ${USER} = "root" ]
then
  echo "Please use with sudo"
  exit 1
fi

LATEST=$(dpkg --list | grep -E -o "linux-image-[0-9]+\.[0-9]+\.[0-9]+-[0-9]+-generic" | grep -o -E "[0-9]+\.[0-9]+\.[0-9]+-[0-9]+" | uniq | sort -n -r | head -1)

TARGETS=$(dpkg --list | grep -E -o "linux-image-[0-9]+\.[0-9]+\.[0-9]+-[0-9]+-generic" | grep -o -E "[0-9]+\.[0-9]+\.[0-9]+-[0-9]+" | uniq | grep -E -v ${LATEST})

for pkg_ver in ${TARGETS}
do
  for pkg_prefix in linux-headers- linux-image-
  do
    apt autoremove --purge -y ${pkg_prefix}${pkg_ver}*
  done
done

update-grub