Download the [linode-auth-hook.sh](https://apps.andysh.uk/aheathershaw/letsencrypt-linode/src/branch/master/linode-auth-hook.sh) and [linode-cleanup-hook.sh](https://apps.andysh.uk/aheathershaw/letsencrypt-linode/src/branch/master/linode-cleanup-hook.sh) shell scripts and make a note of where you have downloaded them to.