[Bug 1690475] Re: TypeError: 'NoneType' object is not callable

[Aarsh S Talati]

Installing update notifier fixed the problem for me in Ubuntu-MATE 18.04
LTS. Code: `$ sudo apt-get install update-notifier`

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https://bugs.launchpad.net/bugs/1690475

Title:
  TypeError: 'NoneType' object is not callable

Status in ubuntu-release-upgrader package in Ubuntu:
  Confirmed

Bug description:
  /usr/bin/update-manager:28: PyGIWarning: Gtk was imported without specifying a version first. Use gi.require_version('Gtk', '3.0') before import to ensure that the right version gets loaded.
    from gi.repository import Gtk
  /usr/lib/python3/dist-packages/UpdateManager/UnitySupport.py:29: PyGIWarning: Dbusmenu was imported without specifying a version first. Use gi.require_version('Dbusmenu', '0.4') before import to ensure that the right version gets loaded.
    from gi.repository import Dbusmenu, Unity
  /usr/lib/python3/dist-packages/UpdateManager/UnitySupport.py:29: PyGIWarning: Unity was imported without specifying a version first. Use gi.require_version('Unity', '7.0') before import to ensure that the right version gets loaded.
    from gi.repository import Dbusmenu, Unity

  (update-manager:26973): GLib-CRITICAL **: g_hash_table_destroy:
  assertion 'hash_table != NULL' failed

  (update-manager:26973): GLib-CRITICAL **: g_hash_table_destroy: assertion 'hash_table != NULL' failed
  Exception ignored in: <object repr() failed>
  Traceback (most recent call last):
    File "/usr/lib/python3/dist-packages/gi/overrides/GLib.py", line 253, in __del__
  TypeError: 'NoneType' object is not callable

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: ubuntu-release-upgrader-core 1:16.04.21
  ProcVersionSignature: Ubuntu 4.8.0-46.49~16.04.1-generic 4.8.17
  Uname: Linux 4.8.0-46-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.5
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: Unity
  Date: Fri May 12 15:42:43 2017
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2017-04-03 (39 days ago)
  InstallationMedia: Ubuntu 16.04.2 LTS "Xenial Xerus" - Release amd64 (20170215.2)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: No upgrade log present (probably fresh install)
  VarLogDistupgradeTermlog:

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