theforeman/community-templates — pull request #128 by mattiasgiese (2014-11-07 14:10:58+00:00)
Title: Adding 'deb' prefixes for additional repositories if OS is Ubuntu >=14.04

This addition fixes installation of Ubuntu 14.04. debian-installer does not include the prefix in their example preseed and it's not in the community-templates.
In my test debian-installer on Ubuntu 14.04 will create an invalid sources.list if the 'deb' prefix is not added in front of the repository string.