sudo apt-get purge linux-headers-4.4.0-64 linux-headers-4.4.0-64-generic linux-headers-4.4.0-66 linux-headers-4.4.0-66-generic linux-headers-4.4.0-70 linux-headers-4.4.0-70-generic linux-headers-4.4.0-71 linux-headers-4.4.0-71-generic linux-headers-4.4.0-72 linux-headers-4.4.0-72-generic linux-headers-4.4.0-75 linux-headers-4.4.0-75-generic linux-headers-4.4.0-78 linux-headers-4.4.0-78-generic linux-headers-4.4.0-79 linux-headers-4.4.0-79-generic linux-headers-4.4.0-81 linux-headers-4.4.0-81-generic linux-headers-4.4.0-83 linux-headers-4.4.0-83-generic linux-image-4.4.0-21-generic linux-image-4.4.0-31-generic linux-image-4.4.0-62-generic linux-image-4.4.0-63-generic linux-image-4.4.0-64-generic linux-image-4.4.0-66-generic linux-image-4.4.0-70-generic linux-image-4.4.0-71-generic linux-image-4.4.0-72-generic linux-image-4.4.0-75-generic linux-image-4.4.0-78-generic linux-image-4.4.0-79-generic linux-image-extra-4.4.0-21-generic linux-image-extra-4.4.0-31-generic linux-image-extra-4.4.0-34-generic linux-image-extra-4.4.0-62-generic linux-image-extra-4.4.0-63-generic linux-image-extra-4.4.0-64-generic linux-image-extra-4.4.0-66-generic linux-image-extra-4.4.0-70-generic linux-image-extra-4.4.0-71-generic linux-image-extra-4.4.0-72-generic linux-image-extra-4.4.0-75-generic linux-image-extra-4.4.0-78-generic linux-image-extra-4.4.0-81-generic