I have some annyoing problem, the Software & Updates won't start when I click on it, but Software Center works fine. Also I noticed that sometimes, Software Updater automaticly turns on promting me with some updates, but when I click on "Install now" nothing happens. I can only press X to close it. This wasn't happening before and I don't know when it started.

I also searched trough search results but nothing worked.

When I run in terminal software-properties-gtk I get this result

/usr/lib/python3/dist-packages/gi/overrides/Gtk.py:1511: Warning: /build/buildd/glib2.0-2.42.2/./gobject/gsignal.c:1211: unable to lookup signal "window-state-event" of unloaded type 'GtkDialog'
  initialized, argv = Gtk.init_check(sys.argv)
/usr/lib/python3/dist-packages/gi/overrides/Gtk.py:1511: Warning: g_signal_add_emission_hook: assertion 'signal_id > 0' failed
  initialized, argv = Gtk.init_check(sys.argv)

** (software-properties-gtk:31131): WARNING **: Couldn't connect to accessibility bus: Failed to connect to socket /tmp/dbus-jSJfg1tbIe: Connection refused
Traceback (most recent call last):
  File "/usr/bin/software-properties-gtk", line 37, in <module>
    from softwareproperties.gtk.SoftwarePropertiesGtk import SoftwarePropertiesGtk
  File "/usr/lib/python3/dist-packages/softwareproperties/gtk/SoftwarePropertiesGtk.py", line 46, in <module>
    from .DialogCacheOutdated import DialogCacheOutdated
  File "/usr/lib/python3/dist-packages/softwareproperties/gtk/DialogCacheOutdated.py", line 28, in <module>
    from aptdaemon.gtk3widgets import AptErrorDialog, AptProgressDialog
  File "/usr/lib/python3/dist-packages/aptdaemon/gtk3widgets.py", line 42, in <module>
    gi.require_version("Vte", "2.91")
  File "/usr/lib/python3/dist-packages/gi/__init__.py", line 83, in require_version
    (namespace, version))
ValueError: Namespace Vte not available for version 2.91

Similar result I also get when I run update-manager

1 Answer 1


Those 2 applications are just graphical front ends for apt. This kind of thing is common with them. Open a terminal, and do:

sudo apt-get update
sudo apt-get upgrade

This may fix or it will tell you what the underlying problem is.


Found an old bug report regarding this. Probably a long shot but make sure package gir1.2-vte-2.91 is installed.

  • OK I tried upgrade and this is the result. The following packages have been kept back: linux-generic-lts-utopic linux-headers-generic-lts-utopic linux-image-generic-lts-utopic linux-signed-image-generic-lts-utopic linux-tools-virtual-lts-xenial shim-signed 0 to upgrade, 0 to newly install, 0 to remove and 6 not to upgrade.
    – facyber
    Jul 18, 2016 at 9:52
  • You did update first as its important. That's fine, does software & updates work now .
    – user5545
    Jul 18, 2016 at 10:29
  • It didn't worked, so I tried sudo apt-get distro-update and it upgraded those packages so now I'm getting The following packages were automatically installed and are no longer required: linux-image-3.16.0-34-generic linux-image-extra-3.16.0-34-generic linux-lts-xenial-tools-4.4.0-28 linux-signed-image-3.16.0-34-generic linux-tools-4.4.0-28-generic Use 'apt-get autoremove' to remove them.
    – facyber
    Jul 18, 2016 at 10:38
  • In my experience its never a good idea to do distribution upgrade, but it's done now. so fingers crossed. Do: sudo-apt-get autoremove as requested and then 'sudo apt-get --reinstall install python-apt update-manager'
    – user5545
    Jul 18, 2016 at 10:56
  • Still not working. Even with reinstalling python-apt. Is there some command to get log output to see why doesn't open apps?
    – facyber
    Jul 18, 2016 at 12:02

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