dpkg -l | grep ii | awk '{print $2}' | \
    grep -E 'linux-(image|headers|ubuntu-modules|restricted-modules)' | \
    grep -vE 'linux-(image|headers|restricted-modules)-(generic|i386|server|common|rt|xen)' | \
    grep -v $(uname -r|sed 's/-*[a-z]//g'|sed 's/-386//g') | \
    xargs apt-get -y purge