This isn’t specific to unity-window-decorator. If you go to ccsm → Effects → Window Decoration and change the command to /usr/bin/gtk- window-decorator, that fails in the same way. ~/.xsession-errors has the line
(gtk-window-decorator:19510): Gtk-WARNING **: cannot open display: :0.0 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/730495 Title: unity-window-decorator doesn't start on secondary X session -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
