Hey,
I tried to install a local instance of MediaWiki according to the quick-start guide found in the Wiki. However, after running vagrant up, the process failed relatively early on since Puppet was throwing an error:
Evaluation Error: Left match operand must result in a String value. Got an Integer. at /vagrant/puppet/modules/mwv/manifests/init.pp:56:8
I figured this was some sort of version incompatibility, so I proceeded to downgrade Vagrant and Virtualbox even though the documentation instructs users to download the latest version of both of them. Initially I had installed Vagrant 2.0.4 and Virtualbox 5.2.10 and my solution was to download Virtualbox 5.1.36 and Vagrant 1.9.8.
Either way, I wanted to bring this issue up so that either the Vagrant set-up is fixed if this is a bug or alternatively suggest that the documentation is adapted to reflect the actual version requirements with the links to the downloadable setups I provided above.
I am not sure if this is relevant, but just in case: I am running the rather newly released Kubuntu 18.04 LTS on this particular machine.