В 16.04 в панели запуска Unity

Программная кнопка Ubuntu выдает пустой экран в течение нескольких секунд, а затем возвращается в Unity. Другие кнопки запуска работают. Недавно я внес изменения во внешний вид с помощью двух твиков.

Пробный терминал software-center получил ошибки и версию центра программного обеспечения Ubuntu, к которой я могу получить доступ через панель управления.

Страницы ошибок читать

software-center
/usr/bin/software-center:25: 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, GObject
/usr/share/software-center/softwarecenter/ui/gtk3/views/purchaseview.py:29: PyGIWarning: WebKit2 was imported without specifying a version first. Use gi.require_version('WebKit2', '4.0') before import to ensure that the right version gets loaded.
  from gi.repository import WebKit2 as webkit
2016-07-09 14:00:52,037 - softwarecenter.backend.zeitgeist_logger - WARNING - Support for Zeitgeist disabled
/usr/share/software-center/softwarecenter/ui/gtk3/widgets/symbolic_icons.py:23: PyGIWarning: PangoCairo was imported without specifying a version first. Use gi.require_version('PangoCairo', '1.0') before import to ensure that the right version gets loaded.
  from gi.repository import Gtk, Gdk, GLib, PangoCairo
2016-07-09 14:00:52,090 - softwarecenter.ui.gtk3.app - INFO - setting up proxy 'None'
2016-07-09 14:00:53,162 - softwarecenter.backend.reviews - WARNING - Could not get usefulness from server, no username in config file
2016-07-09 14:00:53,166 - softwarecenter.plugin - INFO - activating plugin '<module 'webapps_activation' from '/usr/share/software-center/softwarecenter/plugins/webapps_activation.pyc'>'
2016-07-09 14:00:53,220 - softwarecenter.db.pkginfo_impl.aptcache - INFO - aptcache.open()
/usr/lib/python2.7/dist-packages/gi/overrides/GLib.py:585: Warning: Source ID 76 was not found when attempting to remove it
  return super(MainContext, self).iteration(may_block)
2016-07-09 14:00:54,268 - softwarecenter.db.update - WARNING - failed to load file /var/lib/apt-xapian-index/cataloged_times.p: unsupported pickle protocol: 3
/usr/share/software-center/softwarecenter/ui/gtk3/widgets/videoplayer.py:29: PyGIWarning: Gst was imported without specifying a version first. Use gi.require_version('Gst', '1.0') before import to ensure that the right version gets loaded.
  from gi.repository import Gst
/usr/bin/software-center:184: Warning: Source ID 146 was not found when attempting to remove it
  Gtk.main()
2016-07-09 14:00:56,394 - softwarecenter.db.update - WARNING - failed to load file /var/lib/apt-xapian-index/cataloged_times.p: unsupported pickle protocol: 3
2016-07-09 14:00:57,648 - softwarecenter.db.utils - INFO - software-center-agent finished with status 0