[[!comment format=mdwn username="joey" subject="""comment 1""" date="2016-04-26T15:02:03Z" content=""" Well, `backportSuite` takes a `DebianSuite` data type, and `Stable` is a constructor for it. So, you don't quote the data constructor, but only quote the release name string passed to it: (Stable "jessie") But, `backportSuite` is not a property, so you can't add it to a host with `&` anyway. If you're trying to set up a sources.list that can install backports, the way to do it is: & osDebian (Stable "jessie") "amd64" & Apt.stdSourcesList The standard sources.list configuration includes backports when the `DebianSuite` part of the host's OS is a stable release. There's also a property to install packages from backports: & Apt.installedBackport ["somepackage"] """]]