Remove old Ubuntu kernels

remove_old_kernels.sh

#!/bin/bash

current_version=$(uname -r | sed 's/-generic\|-virtual//')

kernels=$(dpkg -l | grep 'linux-image-[0-9]' | awk '{print $2}')
latest_kernel=$(echo $kernels | tr ' ' '\n' | tail -1)
remove_kernels=$(echo $kernels | tr ' ' '\n' | grep -v $latest_kernel | grep -v $current_version)

headers=$(dpkg -l | grep 'linux-headers-[0-9]' | awk '{print $2}')
latest_headers=$(echo $headers | tr ' ' '\n' | tail -1)
remove_headers=$(echo $headers | tr ' ' '\n' | grep -v $latest_headers | grep -v $current_version)

echo "Current kernel: $current_version"
echo "Latest kernel: $latest_kernel"

apt-get remove --purge $remove_kernels $remove_headers