[ubuntu] Software Center not in dropdown menu

roger@roger-desktop:~$ 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
2016-08-10 21:10:10,342 - 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
2016-08-10 21:10:10,476 - softwarecenter.ui.gtk3.app - INFO - setting up proxy 'None'
2016-08-10 21:10:14,717 - softwarecenter.region - WARNING - failed to use geoclue: 'org.freedesktop.Geoclue.Error.notAvailable: Geoclue master client has no usable Address providers'
2016-08-10 21:10:15,379 - softwarecenter.backend.reviews - WARNING - Could not get usefulness from server, no username in config file
2016-08-10 21:10:15,397 - softwarecenter.plugin - INFO - activating plugin ''
2016-08-10 21:10:15,481 - softwarecenter.db.pkginfo_impl.aptcache - INFO - aptcache.open()
2016-08-10 21:10:15,921 - 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 119 was not found when attempting to remove it
Gtk.main()
/usr/bin/software-center:184: Warning: Source ID 78 was not found when attempting to remove it
Gtk.main()
2016-08-10 21:10:19,086 - softwarecenter.db.update - WARNING - failed to load file /var/lib/apt-xapian-index/cataloged_times.p: unsupported pickle protocol: 3
2016-08-10 21:10:20,605 - softwarecenter.db.utils - INFO - software-center-agent finished with status 0
2016-08-10 21:10:20,653 - softwarecenter.db.application - WARNING - document no longer valid after db reopen
2016-08-10 21:10:20,680 - softwarecenter.db.application - WARNING - document no longer valid after db reopen
2016-08-10 21:10:20,713 - softwarecenter.db.application - WARNING - document no longer valid after db reopen
2016-08-10 21:10:20,747 - softwarecenter.db.application - WARNING - document no longer valid after db reopen
2016-08-10 21:10:20,784 - softwarecenter.db.application - WARNING - document no longer valid after db reopen
2016-08-10 21:10:20,795 - softwarecenter.db.application - WARNING - document no longer valid after db reopen
2016-08-10 21:10:20,796 - softwarecenter.db.application - WARNING - document no longer valid after db reopen
2016-08-10 21:10:20,798 - softwarecenter.db.application - WARNING - document no longer valid after db reopen
org.freedesktop.DBus.Error.Spawn.ChildExited: Launch helper exited with unknown return code 1
No handlers could be found for logger "update-software-center-chaels"
roger@roger-desktop:~$