Though it’s really great that Puppet made it into Ubuntu’s main repository, the provided version is rather outdated which prevents you from using advanced language features when writing your manifests. So sooner or later you end up installing Puppet manually. In order to speed up installation I stripped it down to the following:
$ bash < <(wget -qO - https://bit.ly/install-puppet-agent)
$ bash < <(wget -qO - https://bit.ly/install-puppet-master)
The call fetches the most recent version of the install script from github, installs Ubuntu’s Ruby (which is good enough for running Puppet), fetches an upstream version of gem itself and updates it to the most recent version and finally installs the Puppet gem.
You can, of course, also download, review and run the scripts manually. Just have a look at https://github.com/moviepilot/puppet/tree/master/tools