Public bug reported:

Hello,
This issue is happening very often

$ software-properties-gtk 
ERROR:dbus.proxies:Introspect error on :1.127:/: dbus.exceptions.DBusException: 
org.freedesktop.DBus.Error.NoReply: Message recipient disconnected from message 
bus without replying
Traceback (most recent call last):
  File "/usr/bin/software-properties-gtk", line 100, in <module>
    app = SoftwarePropertiesGtk(datadir=options.data_dir, options=options, 
file=file)
  File 
"/usr/lib/python3/dist-packages/softwareproperties/gtk/SoftwarePropertiesGtk.py",
 line 211, in __init__
    self.backend.Reload();
  File "/usr/lib/python3/dist-packages/dbus/proxies.py", line 72, in __call__
    return self._proxy_method(*args, **keywords)
  File "/usr/lib/python3/dist-packages/dbus/proxies.py", line 141, in __call__
    return self._connection.call_blocking(self._named_service,
  File "/usr/lib/python3/dist-packages/dbus/connection.py", line 652, in 
call_blocking
    reply_message = self.send_message_with_reply_and_block(
dbus.exceptions.DBusException: org.freedesktop.DBus.Error.ServiceUnknown: The 
name :1.127 was not provided by any .service files


I tried the usual solution I used before:

$ sudo apt-get update && sudo apt-get install --reinstall python3-six
python3-certifi

However, the package is still broken and there is no way to open
software and updates.


=====================================
$ lsb_release -rd
Description:    Ubuntu 20.04.2 LTS
Release:        20.04
=====================================
$ apt-cache policy software-properties-gtk 
software-properties-gtk:
  Installed: 0.98.9.5
  Candidate: 0.98.9.5
  Version table:
 *** 0.98.9.5 500
        500 http://archive.ubuntu.com/ubuntu focal-updates/main amd64 Packages
        500 http://archive.ubuntu.com/ubuntu focal-updates/main i386 Packages
        100 /var/lib/dpkg/status
     0.98.9.2 500
        500 http://archive.ubuntu.com/ubuntu focal-security/main amd64 Packages
        500 http://archive.ubuntu.com/ubuntu focal-security/main i386 Packages
     0.98.9 500
        500 http://archive.ubuntu.com/ubuntu focal/main amd64 Packages
        500 http://archive.ubuntu.com/ubuntu focal/main i386 Packages
======================================

** Affects: software-properties (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1930974

Title:
  software-properties-gtk is broken again

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