Unable to use gnome-tweak-tools from debian template

[Scinawa]

Qubes OS version:

4.0 R4.0

Affected component(s):

All debian 9 app VMs and the template.

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Steps to reproduce the behavior:

Simply run gnome-tweak-tools from command line, Qube Manager (run command in appvm) and apply some edits. The software is executed , but the modifications (like the scaling factor of the fonts) are not applied upon quitting the windows, like with other fedora templates.

Expected behavior:

I expect to have the settings updated (like it happend with fedora template) when I close the software. Specifically I would like to update the scaling factor of the fonts of the qube.

Actual behavior:

WARNING : Shell not installed or running
WARNING : Shell not running
None
WARNING : Error detecting shell
Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/gtweak/tweaks/tweak_group_shell_extensions.py", line 275, in __init__
    raise Exception("Shell not running or DBus service not available")
Exception: Shell not running or DBus service not available

General notes:

I tried to run a gnome-shell, but withtout success. I'm using i3 (thianks!) but the problem persist even from XFCE.

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Related issues: