[Bug 1899995] [NEW] ubuntu 20.4 update-manager “Settings & Livepatch” not starting

[cprecht2123]

Public bug reported:

Bug:
ubuntu update-manager Updates work perfectly, but when trying to open “Settings & Livepatch” the following error is returned in the terminal and “Settings & Livepatch”  does not open.

ERROR:dbus.proxies:Introspect error on :1.172:/: 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 :1.172 was not provided by any .service files

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: update-manager 1:20.04.10.1
ProcVersionSignature: Ubuntu 5.4.0-51.56-generic 5.4.65
Uname: Linux 5.4.0-51-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.9
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Thu Oct 15 16:51:11 2020
InstallationDate: Installed on 2020-10-09 (5 days ago)
InstallationMedia: Ubuntu 20.04.1 LTS "Focal Fossa" - Release amd64 (20200731)
PackageArchitecture: all
SourcePackage: update-manager
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: update-manager (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug focal

** Attachment added: "Screenshot from 2020-10-15 17-09-30.png"
   https://bugs.launchpad.net/bugs/1899995/+attachment/5422643/+files/Screenshot%20from%202020-10-15%2017-09-30.png

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https://bugs.launchpad.net/bugs/1899995

Title:
  ubuntu 20.4 update-manager “Settings & Livepatch”  not starting

Status in update-manager package in Ubuntu:
  New

Bug description:
  Bug:
  ubuntu update-manager Updates work perfectly, but when trying to open “Settings & Livepatch” the following error is returned in the terminal and “Settings & Livepatch”  does not open.

  ERROR:dbus.proxies:Introspect error on :1.172:/: 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 :1.172 was not provided by any .service files

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: update-manager 1:20.04.10.1
  ProcVersionSignature: Ubuntu 5.4.0-51.56-generic 5.4.65
  Uname: Linux 5.4.0-51-generic x86_64
  ApportVersion: 2.20.11-0ubuntu27.9
  Architecture: amd64
  CasperMD5CheckResult: skip
  CurrentDesktop: ubuntu:GNOME
  Date: Thu Oct 15 16:51:11 2020
  InstallationDate: Installed on 2020-10-09 (5 days ago)
  InstallationMedia: Ubuntu 20.04.1 LTS "Focal Fossa" - Release amd64 (20200731)
  PackageArchitecture: all
  SourcePackage: update-manager
  UpgradeStatus: No upgrade log present (probably fresh install)

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