The Omnibus install guide is broken

[sneakinhysteria]

I spent hours trying to get my Docker based MM deployment to work (cert.pem error, like many, but I followed your instructions to the letter on a fresh Ubuntu) and then I found the references to Omnibus as a quicker and more reliable path.

Unfortunately, the Install instructions at don't explains steps needed to do this. The only other MM article I could find on it includes a bash command that fails for me (bash: line 74: add-apt-repository: command not found). Where can I find a documentation that I can use?