Apliqué algún tema justo después de instalar Ubuntu MATE 16.04.
Ahora el actualizador de software no aparece cuando se llama desde el menú.
Esto es lo que dice en la terminal:
(update-manager:5977): Gtk-WARNING **: Theme parsing error: gtk.css:27:35: Junk at end of value
(update-manager:5977): Gtk-WARNING **: Theme parsing error: gtk.css:40:48: Junk at end of value
(update-manager:5977): Gtk-WARNING **: Theme parsing error: gtk.css:48:46: Junk at end of value
(update-manager:5977): Gtk-WARNING **: Theme parsing error: gtk.css:59:58: Junk at end of value
(update-manager:5977): Gtk-WARNING **: Theme parsing error: gtk.css:70:46: Junk at end of value
(update-manager:5977): Gtk-WARNING **: Theme parsing error: gtk.css:81:58: Junk at end of value
/usr/bin/update-manager:28: PyGIWarning: Gtk was imported without specifying a version first. Use gi.require_version('Gtk', '3.0') before import to ensure that the right version gets loaded.
from gi.repository import Gtk
/usr/lib/python3/dist-packages/UpdateManager/UnitySupport.py:29: PyGIWarning: Dbusmenu was imported without specifying a version first. Use gi.require_version('Dbusmenu', '0.4') before import to ensure that the right version gets loaded.
from gi.repository import Dbusmenu, Unity
/usr/lib/python3/dist-packages/UpdateManager/UnitySupport.py:29: PyGIWarning: Unity was imported without specifying a version first. Use gi.require_version('Unity', '7.0') before import to ensure that the right version gets loaded.
from gi.repository import Dbusmenu, Unity