I was able to reproduce it during an upgrade from Ubuntu Desktop lucid amd64 to precise.
Excerpt from apt.log Investigating (0) indicator-appmenu [ amd64 ] < none -> 0.3.97-0ubuntu1 > ( gnome ) Broken indicator-appmenu:amd64 Conflicts on libdbusmenu-glib1 [ amd64 ] < 0.2.9-0ubuntu3.1 > ( libs ) (< 0.3.7) Considering libdbusmenu-glib1:amd64 9 as a solution to indicator-appmenu:amd64 3 Holding Back indicator-appmenu:amd64 rather than change libdbusmenu-glib1:amd64
I was able to reproduce it during an upgrade from Ubuntu Desktop lucid amd64 to precise.
Excerpt from apt.log appmenu: amd64 Conflicts on libdbusmenu-glib1 [ amd64 ] < 0.2.9-0ubuntu3.1 > ( libs ) (< 0.3.7) glib1:amd64 9 as a solution to indicator- appmenu: amd64 3 appmenu: amd64 rather than change libdbusmenu- glib1:amd64
Investigating (0) indicator-appmenu [ amd64 ] < none -> 0.3.97-0ubuntu1 > ( gnome )
Broken indicator-
Considering libdbusmenu-
Holding Back indicator-