[Bug 1948002] [NEW] software-properties-gtk crashes

[robas]

Public bug reported:

When I try to run "Software and updates" from launcher, nothing happens,
try to do so in terminal, there is a report:

@ubuntux:~$ software-properties-gtk 
ERROR:dbus.proxies:Introspect error on :1.175:/: 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 :1.175 was not provided by any .service files


Ubuntu 20.04.3 LTS

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

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https://bugs.launchpad.net/bugs/1948002

Title:
  software-properties-gtk crashes

Status in software-properties package in Ubuntu:
  New

Bug description:
  When I try to run "Software and updates" from launcher, nothing
  happens, try to do so in terminal, there is a report:

  @ubuntux:~$ software-properties-gtk 
  ERROR:dbus.proxies:Introspect error on :1.175:/: 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 :1.175 was not provided by any .service files

  
  Ubuntu 20.04.3 LTS

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