The 'build-ubuntu12' seems to generate the appropriate debian packages for the distribution.
I had permissions issues (probably related to shared folder usage) with the dpkg tools. So I've removed them. If we happen to need them, we'll have to figure out a build process.
This environment probably shouldn't be used to test the packages, since omnibus likes to dirty everything up, leave files in the /opt/perforce directory owned by vagrant, etc.