Public bug reported:

Gives the following error. Doesn't start at all.

$ gnome-tweak-tool
WARNING : Error detecting shell
Traceback (most recent call last):
  File 
"/usr/lib/python2.7/dist-packages/gtweak/tweaks/tweak_shell_extensions.py", 
line 172, 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 161, 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
INFO    : GSettings missing key org.gnome.nautilus.desktop (key 
computer-icon-visible)
INFO    : Schema missing summary 
org.gnome.settings-daemon.peripherals.gschema.xml (key repeat)
INFO    : Schema missing summary 
org.gnome.settings-daemon.peripherals.gschema.xml (key click)
INFO    : Schema missing summary 
org.gnome.settings-daemon.peripherals.gschema.xml (key click-volume)
INFO    : Schema missing summary 
org.gnome.settings-daemon.peripherals.gschema.xml (key bell-mode)
INFO    : Schema missing summary 
org.gnome.settings-daemon.peripherals.gschema.xml (key bell-pitch)
INFO    : Schema missing summary 
org.gnome.settings-daemon.peripherals.gschema.xml (key bell-duration)
Traceback (most recent call last):
  File "/usr/bin/gnome-tweak-tool", line 75, in <module>
    MainWindow()
  File "/usr/lib/python2.7/dist-packages/gtweak/mainwindow.py", line 41, in 
__init__
    model)
  File "/usr/lib/python2.7/dist-packages/gtweak/tweakview.py", line 58, in 
__init__
    self._model.load_tweaks()
  File "/usr/lib/python2.7/dist-packages/gtweak/tweakmodel.py", line 147, in 
load_tweaks
    mods = __import__("gtweak.tweaks", globals(), locals(), tweak_files, 0)
  File "/usr/lib/python2.7/dist-packages/gtweak/tweaks/tweak_shell.py", line 
209, in <module>
    class StaticWorkspaceTweak(Tweak):
  File "/usr/lib/python2.7/dist-packages/gtweak/tweaks/tweak_shell.py", line 
214, in StaticWorkspaceTweak
    _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 161, 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)
gi._glib.GError: GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The 
name org.gnome.Shell was not provided by any .service files


System Info:
Distro: Quantal Quetzal
Package version: 3.7.0

** Affects: gnome-tweak-tool (Ubuntu)
     Importance: Undecided
         Status: New

** Attachment added: "Results of "gnome-tweak-tool -d"."
   
https://bugs.launchpad.net/bugs/1094464/+attachment/3470152/+files/Debug_GTT.txt

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https://bugs.launchpad.net/bugs/1094464

Title:
  Gnome-tweak-tool returns "Erro detecting Shell" on start up and
  crashes

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