Looking for a complete tutorial to using dokku and Ubuntu 16.04

I’m trying to set up a droplet with dokku - I used the one click app for Dokku on 16.04. Unfortunately I can’t find any tutorials which actually go through all the steps to get this working.

after $git push remote_name master

currently stuck with:

ssh: Could not resolve hostname [...*]: Name or service not known fatal: Could not read from remote repository.

Please make sure you have the correct access rights and the repository exists.

according to the tutorial ( https://www.digitalocean.com/community/tutorials/how-to-use-the-dokku-one-click-install-image-to-deploy-your-app ) this should now just be working - of course that tutorial is many years out of date but its the best I could find.

Any ideas? or can anyone point me to a tutorial that shows how to get this working?

Thanks in advance,

Johnny