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When I run gnome-tweak-tool after installation,the terminal shows this:

WARNING : Error detecting shell Traceback (most recent call last): File "/usr/lib/python2.7/dist-packages/gtweak/tweaks/tweak_shell_extensions.py", line 169, in init shell = GnomeShellFactory().get_shell() File "/usr/lib/python2.7/dist-packages/gtweak/utils.py", line 39, in getinstance instances[cls] = cls() File "/usr/lib/python2.7/dist-packages/gtweak/gshellwrapper.py", line 139, in init proxy = _ShellProxy() File "/usr/lib/python2.7/dist-packages/gtweak/gshellwrapper.py", line 53, in init result, output = self.proxy.Eval('(s)', js) File "/usr/lib/python2.7/dist-packages/gi/overrides/Gio.py", line 164, in call None) File "/usr/lib/python2.7/dist-packages/gi/types.py", line 47, in function return info.invoke(*args, **kwargs) GError: GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name org.gnome.Shell was not provided by any .service files WARNING : Schema /usr/share/glib-2.0/schemas/org.gnome.settings-daemon.peripherals.gschema.xml missing summary text: true WARNING : Schema /usr/share/glib-2.0/schemas/org.gnome.settings-daemon.peripherals.gschema.xml missing summary text: true WARNING : Schema /usr/share/glib-2.0/schemas/org.gnome.settings-daemon.peripherals.gschema.xml missing summary text: 0 WARNING : Schema /usr/share/glib-2.0/schemas/org.gnome.settings-daemon.peripherals.gschema.xml missing summary text: 'on' Possible values are "on", "off", and "custom". WARNING : Schema /usr/share/glib-2.0/schemas/org.gnome.settings-daemon.peripherals.gschema.xml missing summary text: 400 WARNING : Schema /usr/share/glib-2.0/schemas/org.gnome.settings-daemon.peripherals.gschema.xml missing summary text: 100 INFO : Missing gsettings org.gnome.settings-daemon.peripherals.keyboard (key input-sources-switcher) WARNING : Shell not running Traceback (most recent call last): File "/usr/lib/python2.7/dist-packages/gtweak/tweaks/tweak_shell.py", line 60, in init self._shell = GnomeShellFactory().get_shell() File "/usr/lib/python2.7/dist-packages/gtweak/utils.py", line 39, in getinstance instances[cls] = cls() File "/usr/lib/python2.7/dist-packages/gtweak/gshellwrapper.py", line 139, in init proxy = _ShellProxy() File "/usr/lib/python2.7/dist-packages/gtweak/gshellwrapper.py", line 53, in init result, output = self.proxy.Eval('(s)', js) File "/usr/lib/python2.7/dist-packages/gi/overrides/Gio.py", line 164, in call None) File "/usr/lib/python2.7/dist-packages/gi/types.py", line 47, in function return info.invoke(*args, **kwargs) GError: GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name org.gnome.Shell was not provided by any .service files WARNING : Could not list shell extensions Traceback (most recent call last): File "/usr/lib/python2.7/dist-packages/gtweak/tweaks/tweak_shell.py", line 65, in init extensions = self._shell.list_extensions() AttributeError: ShellThemeTweak instance has no attribute '_shell' INFO : Missing gsettings org.gnome.settings-daemon.plugins.power (key lid-close-suspend-with-external-monitor)

(gnome-tweak-tool:2519): Gtk-CRITICAL **: gtk_widget_get_preferred_height_for_width: assertion `width >= 0' failed

(gnome-tweak-tool:2519): Gtk-CRITICAL **: gtk_widget_get_preferred_height_for_width: assertion `width >= 0' failed

(gnome-tweak-tool:2519): Gtk-CRITICAL **: gtk_widget_get_preferred_height_for_width: assertion `width >= 0' failed

(gnome-tweak-tool:2519): Gtk-CRITICAL **: gtk_widget_get_preferred_height_for_width: assertion `width >= 0' failed

(gnome-tweak-tool:2519): Gtk-CRITICAL **: gtk_widget_get_preferred_height_for_width: assertion `width >= 0' failed

(gnome-tweak-tool:2519): Gtk-CRITICAL **: gtk_widget_get_preferred_height_for_width: assertion `width >= 0' failed

(gnome-tweak-tool:2519): Gtk-CRITICAL **: gtk_widget_get_preferred_height_for_width: assertion `width >= 0' failed

(gnome-tweak-tool:2519): Gtk-CRITICAL **: gtk_widget_get_preferred_height_for_width: assertion `width >= 0' failed

(gnome-tweak-tool:2519): Gtk-CRITICAL **: gtk_widget_get_preferred_height_for_width: assertion `width >= 0' failed

(gnome-tweak-tool:2519): Gtk-CRITICAL **: gtk_widget_get_preferred_height_for_width: assertion `width >= 0' failed

(gnome-tweak-tool:2519): Gtk-CRITICAL **: gtk_widget_get_preferred_height_for_width: assertion `width >= 0' failed

(gnome-tweak-tool:2519): Gtk-CRITICAL **: gtk_widget_get_preferred_height_for_width: assertion `width >= 0' failed

(gnome-tweak-tool:2519): Gtk-CRITICAL **: gtk_widget_get_preferred_height_for_width: assertion `width >= 0' failed

(gnome-tweak-tool:2519): Gtk-CRITICAL **: gtk_widget_get_preferred_height_for_width: assertion `width >= 0' failed

(gnome-tweak-tool:2519): Gtk-CRITICAL **: gtk_widget_get_preferred_height_for_width: assertion `width >= 0' failed

(gnome-tweak-tool:2519): Gtk-CRITICAL **: gtk_widget_get_preferred_height_for_width: assertion `width >= 0' failed

(gnome-tweak-tool:2519): Gtk-CRITICAL **: gtk_widget_get_preferred_height_for_width: assertion `width >= 0' failed

(gnome-tweak-tool:2519): Gtk-CRITICAL **: gtk_widget_get_preferred_height_for_width: assertion `width >= 0' failed

(gnome-tweak-tool:2519): Gtk-CRITICAL **: gtk_widget_get_preferred_height_for_width: assertion `width >= 0' failed

(gnome-tweak-tool:2519): Gtk-CRITICAL **: gtk_widget_get_preferred_height_for_width: assertion `width >= 0' failed

(gnome-tweak-tool:2519): Gtk-CRITICAL **: gtk_widget_get_preferred_height_for_width: assertion `width >= 0' failed

(gnome-tweak-tool:2519): Gtk-CRITICAL **: gtk_widget_get_preferred_height_for_width: assertion `width >= 0' failed

(gnome-tweak-tool:2519): Gtk-CRITICAL **: gtk_widget_get_preferred_height_for_width: assertion `width >= 0' failed

(gnome-tweak-tool:2519): Gtk-CRITICAL **: gtk_widget_get_preferred_height_for_width: assertion `width >= 0' failed

(gnome-tweak-tool:2519): Gtk-CRITICAL **: gtk_widget_get_preferred_height_for_width: assertion `width >= 0' failed

(gnome-tweak-tool:2519): Gtk-CRITICAL **: gtk_widget_get_preferred_height_for_width: assertion `width >= 0' failed

(gnome-tweak-tool:2519): Gtk-CRITICAL **: gtk_widget_get_preferred_height_for_width: assertion `width >= 0' failed

(gnome-tweak-tool:2519): Gtk-CRITICAL **: gtk_widget_get_preferred_height_for_width: assertion `width >= 0' failed

(gnome-tweak-tool:2519): Gtk-CRITICAL **: gtk_widget_get_preferred_height_for_width: assertion `width >= 0' failed

How I can fix this? I read a solution on this forum,about to force to 3.4 version but with synaptic isn't possible because I can't click on this feature.

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