So, you could try running yum and apt and see if either of those package-management commands exist.
Our certbot-auto bootstrap script is not going to be able to bootstrap Certbot on your system.
You might want to try one of the bash clients from
They have relatively few dependencies and can often run on a wide range of operating systems without installing a lot of additional software. (Unlike Certbot, they don't attempt to edit your web server configuration to install the certificate after obtaining it, so you'll have to install the certificate in your web server yourself.)