[Bug 1876726] Re: software-properties-gtk crashes: dbus.proxies error

[Sebastien Bacher]

Thank you for your bug report, how did you install python3.7?

** Changed in: software-properties (Ubuntu)
   Importance: Undecided => Low

** Changed in: software-properties (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1876726

Title:
  software-properties-gtk crashes: dbus.proxies error

Status in software-properties package in Ubuntu:
  Incomplete

Bug description:
  Expected: software-properties-gtk should launch properly; instead it
  crashes and doesn't launch.

  Out of the blue, I couldn't open Software&Updates so I checked the
  output of software-properties-gtk which is:

  ```
  WARNING:root:system-image-cli failed, using defaults: [Errno 13] Permission denied: 'system-ima
  WARNING:root:system-image-cli failed, using defaults: [Errno 13] Permission denied: 'system-ima
  ERROR:dbus.proxies:Introspect error on :1.159:/: 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 172, in __init__
      self.backend.Reload();
    File "/usr/lib/python3/dist-packages/dbus/proxies.py", line 70, in __call__
      return self._proxy_method(*args, **keywords)
    File "/usr/lib/python3/dist-packages/dbus/proxies.py", line 145, in __call__
      **keywords)
    File "/usr/lib/python3/dist-packages/dbus/connection.py", line 651, in call_blocking
      message, timeout)
  dbus.exceptions.DBusException: org.freedesktop.DBus.Error.ServiceUnknown: The name :1.159 was not provided by any .service files
  ```

  If I launch it with sudo I get circa the same output:
  ```
  ERROR:dbus.proxies:Introspect error on :1.167:/: 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 172, in __init__
      self.backend.Reload();
    File "/usr/lib/python3/dist-packages/dbus/proxies.py", line 70, in __call__
      return self._proxy_method(*args, **keywords)
    File "/usr/lib/python3/dist-packages/dbus/proxies.py", line 145, in __call__
      **keywords)
    File "/usr/lib/python3/dist-packages/dbus/connection.py", line 651, in call_blocking
      message, timeout)
  dbus.exceptions.DBusException: org.freedesktop.DBus.Error.ServiceUnknown: The name :1.167 was not provided by any .service files
  ```

  Additional info:

  $ uname -r
  `5.3.0-51-generic`

  $ dpkg -l software-properties-gtk | grep ii       
  ```
  ii  software-properties-gtk 0.96.24.32.12 all          manage the repositories that you install software from (gtk)
  ```

  $ apt-cache policy software-properties-gtk
  ```
  software-properties-gtk:
    Installed: 0.96.24.32.12
    Candidate: 0.96.24.32.12
    Version table:
   *** 0.96.24.32.12 500
          500 http://it.archive.ubuntu.com/ubuntu bionic-updates/main amd64 Packages
          500 http://it.archive.ubuntu.com/ubuntu bionic-updates/main i386 Packages
          100 /var/lib/dpkg/status
       0.96.24.32.1 500
          500 http://it.archive.ubuntu.com/ubuntu bionic/main amd64 Packages
          500 http://it.archive.ubuntu.com/ubuntu bionic/main i386 Packages
  ```

  Release: Ubuntu 18.04.4 LTS

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