[Bug 1020240] Re: backend_helper.py crashed with Depends in _run(): python3-distupgrade (= 1:0.165) but it is not installed

[col reilly]

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Title:
  backend_helper.py crashed with Depends in _run(): python3-distupgrade
  (= 1:0.165) but it is not installed

Status in “update-notifier” package in Ubuntu:
  Confirmed

Bug description:
  tried a cli update via apt.
  error happened. tried it via the gui. following error:

  The following packages have unmet dependencies:
  python3-update-manager: Depends: python3-distupgrade but it is not installed
  ubuntu-release-upgrader-core: Depends: python3-distupgrade (= 1:0.165) but it is not installed
  ubuntu-release-upgrader-gtk: Depends: ubuntu-release-upgrader-core (= 1:0.165) but 1:0.165 is installed
  Depends: python3-distupgrade (= 1:0.165) but it is not installed

  apt-get install -f seems to fix it

  ProblemType: Crash
  DistroRelease: Ubuntu 12.10
  Package: update-notifier-common 0.119ubuntu15
  ProcVersionSignature: Ubuntu 3.5.0-2.2-generic 3.5.0-rc4
  Uname: Linux 3.5.0-2-generic x86_64
  ApportVersion: 2.2.5-0ubuntu1
  Architecture: amd64
  Date: Mon Jul  2 19:56:09 2012
  ExecutablePath: /usr/lib/update-notifier/backend_helper.py
  InstallationMedia: Xubuntu 12.10 "Quantal Quetzal" - Alpha amd64 (20120620)
  InterpreterPath: /usr/bin/python2.7
  PackageArchitecture: all
  ProcCmdline: /usr/bin/python /usr/lib/update-notifier/backend_helper.py install_all_updates
  ProcEnviron:
   LANGUAGE=en_GB:en
   PATH=(custom, no user)
   LANG=en_GB.UTF-8
   SHELL=/bin/bash
  PythonArgs: ['/usr/lib/update-notifier/backend_helper.py', 'install_all_updates']
  SourcePackage: update-notifier
  Title: backend_helper.py crashed with                              Depends in _run(): python3-distupgrade (= 1:0.165) but it is not installed
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo

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