Well, it has not yet landed in Ubuntu, it is new to GTK+3.12, and is not
distribution dependent, the only think that is needed is GTK+3.12.
It
will take time, and I think that it will be in the GNOME PPA sooner
than in main-line Ubuntu, and by the time GPump is finished GTK3.12 will
probably be in main-line Ubuntu, as it is in Arch, Gentoo(?), Fedora,
and many more already,
Gustav Hartvigsson at 2014-04-15T21:18:23Z