I also observe after choosing "Install all updates" from the tray icon that a minimized window for the gksu password prompt appears on the taskbar, but the actual window does not appear. After some time, the indicator on the taskbar disappears.
I also observe after choosing "Install all updates" from the tray icon that a minimized window for the gksu password prompt appears on the taskbar, but the actual window does not appear. After some time, the indicator on the taskbar disappears.