Public bug reported:

Seen on Ubuntu 20.04 
libgtk-3-0 version 3.24.20

Use case
========
We want to check if Gtk is available without actually using it. Once we confirm 
that it is available we can start using it, or take another route if it is 
unavailable.


Steps to reproduce
==================
The display must be unset, which is the default behaviour when ssh:ing to a 
machine. Then import Gtk in Python to get the error message.

cendio@ubuntu2004:~$ DISPLAY= python3
Python 3.8.10 (default, Jun 22 2022, 20:18:18) 
[GCC 9.4.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import gi
>>> gi.require_version("Gtk", "3.0")
>>> from gi.repository import Gtk
Unable to init server: Could not connect: Connection refused
Unable to init server: Could not connect: Connection refused

Expected result
===============
Importing Gtk should not give error messages. 

In Ubuntu 22.04, this issue is not present:
cendio@ubuntu-22:~$ DISPLAY= python3
Python 3.10.4 (main, Apr  2 2022, 09:04:19) [GCC 11.2.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import gi
>>> gi.require_version("Gtk", "3.0")
>>> from gi.repository import Gtk

Other comments
==============
Aside from the error message, everything seem to be working as expected. The 
errors are not Gtk errors, so it is unclear how they can be silenced.

** Affects: gtk+3.0 (Ubuntu)
     Importance: Undecided
         Status: New

** Package changed: snapd (Ubuntu) => gtk+3.0 (Ubuntu)

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https://bugs.launchpad.net/bugs/1988536

Title:
  Importing Gtk in Python without a valid DISPLAY gives error message

Status in gtk+3.0 package in Ubuntu:
  New

Bug description:
  Seen on Ubuntu 20.04 
  libgtk-3-0 version 3.24.20

  Use case
  ========
  We want to check if Gtk is available without actually using it. Once we 
confirm that it is available we can start using it, or take another route if it 
is unavailable.

  
  Steps to reproduce
  ==================
  The display must be unset, which is the default behaviour when ssh:ing to a 
machine. Then import Gtk in Python to get the error message.

  cendio@ubuntu2004:~$ DISPLAY= python3
  Python 3.8.10 (default, Jun 22 2022, 20:18:18) 
  [GCC 9.4.0] on linux
  Type "help", "copyright", "credits" or "license" for more information.
  >>> import gi
  >>> gi.require_version("Gtk", "3.0")
  >>> from gi.repository import Gtk
  Unable to init server: Could not connect: Connection refused
  Unable to init server: Could not connect: Connection refused

  Expected result
  ===============
  Importing Gtk should not give error messages. 

  In Ubuntu 22.04, this issue is not present:
  cendio@ubuntu-22:~$ DISPLAY= python3
  Python 3.10.4 (main, Apr  2 2022, 09:04:19) [GCC 11.2.0] on linux
  Type "help", "copyright", "credits" or "license" for more information.
  >>> import gi
  >>> gi.require_version("Gtk", "3.0")
  >>> from gi.repository import Gtk

  Other comments
  ==============
  Aside from the error message, everything seem to be working as expected. The 
errors are not Gtk errors, so it is unclear how they can be silenced.

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