Comment 7 for bug 163518

The ubiquity GTK frontend has explicit handling for GNOME and XFCE to deal with disabling volume managers; if this weren't there then it would cause difficult bugs during partitioning. (It also has explicit reboot handling for GNOME.) I am not prepared to say that it works in any desktop environment without similar explicit handling. If you've confirmed it to work end-to-end in some other desktop environment, please send a patch to enable it in OnlyShowIn.