Comment 9 for bug 966474

Its a bit confusing, its listed as a unused dependency:

2012-03-26 19:01:09,206 DEBUG Unused dependencies: appmenu-gtk

And that happens because:
Investigating (0) indicator-appmenu [ i386 ] < none -> 0.3.95-0ubuntu2 > ( gnome )
Broken indicator-appmenu:i386 Conflicts on libdbusmenu-glib1 [ i386 ] < 0.2.9-0ubuntu3.1 > ( libs ) (< 0.3.7)
  Considering libdbusmenu-glib1:i386 9 as a solution to indicator-appmenu:i386 3
  Holding Back indicator-appmenu:i386 rather than change libdbusmenu-glib1:i386

And that seems to be the conflict on the no-longer existing libdbusmenu-glib1. But libdbusmenu-glib1 has a higher
score (9) probably because a bunch of the installed stuff depends on it so apt feels like it should not remove it.