[Bug 1530854] Re: Kubuntu upgrade from 15.04 to 15.10 crashes when dpkg asks about config file changes

[Brian Murray]

** Tags added: kubuntu

** Tags added: vivid

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Title:
  Kubuntu upgrade from 15.04 to 15.10 crashes when dpkg asks about
  config file changes

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

Bug description:
  I just tried to to upgrade my system form 15.04 to 15.10 and like last
  time I tried to update from 14.10 to 15.04 (see #1448380) the release-
  upgrade crashed at this point.

  This is the error in /var/log/dist-upgrade/main.log:
  ---------------------------------------------------------------------------
  2016-01-04 12:47:20,781 ERROR not handled exception in KDE frontend:
  Traceback (most recent call last):

    File "/tmp/ubuntu-release-upgrader-1ni4jss9/wily", line 8, in <module>
      sys.exit(main())

    File "/tmp/ubuntu-release-upgrader-1ni4jss9/DistUpgrade/DistUpgradeMain.py", line 240, in main
      if app.run():

    File "/tmp/ubuntu-release-upgrader-1ni4jss9/DistUpgrade/DistUpgradeController.py", line 1837, in run
      return self.fullUpgrade()

    File "/tmp/ubuntu-release-upgrader-1ni4jss9/DistUpgrade/DistUpgradeController.py", line 1802, in fullUpgrade
      if not self.doDistUpgrade():

    File "/tmp/ubuntu-release-upgrader-1ni4jss9/DistUpgrade/DistUpgradeController.py", line 1143, in doDistUpgrade
      res = self.cache.commit(fprogress,iprogress)

    File "/tmp/ubuntu-release-upgrader-1ni4jss9/DistUpgrade/DistUpgradeCache.py", line 267, in commit
      apt.Cache.commit(self, fprogress, iprogress)

    File "/usr/lib/python3/dist-packages/apt/cache.py", line 501, in commit
      # which is less than optimal!

    File "/usr/lib/python3/dist-packages/apt/cache.py", line 465, in
  install_archives

    File "/tmp/ubuntu-release-upgrader-1ni4jss9/DistUpgrade/DistUpgradeView.py", line 234, in run
      res = os.WEXITSTATUS(self.wait_child())

    File "/tmp/ubuntu-release-upgrader-1ni4jss9/DistUpgrade/DistUpgradeViewKDE.py", line 451, in wait_child
      self.update_interface()

    File "/tmp/ubuntu-release-upgrader-1ni4jss9/DistUpgrade/DistUpgradeViewKDE.py", line 430, in update_interface
      InstallProgress.update_interface(self)

    File "/usr/lib/python3/dist-packages/apt/progress/base.py", line 252, in update_interface
      self.conffile(match.group(1), match.group(2))

    File "/tmp/ubuntu-release-upgrader-1ni4jss9/DistUpgrade/DistUpgradeViewKDE.py", line 339, in conffile
      self.confDialogue.show_difference_button.clicked.connect(self.showConffile())

  TypeError: argument 1 has unexpected type 'NoneType'

  2016-01-04 12:47:20,781 DEBUG running apport_crash()
  2016-01-04 12:47:20,815 DEBUG enabling apt cron job
  --------------------------------------------------------------------------------------------------------

  The first lines with the version information are (I think in this case these are more relevant than apt-cache policy output which might show versions from the upgraded system):
  -------------------------------------------------------------------------------------------------------
  2016-01-04 12:10:29,829 INFO Using config files '['./DistUpgrade.cfg']'
  2016-01-04 12:10:29,829 INFO uname information: 'Linux liwonb 3.19.0-42-generic #48-Ubuntu SMP Thu Dec 17 22:54:45 UTC 2
  015 x86_64'
  2016-01-04 12:10:29,829 INFO apt version: '1.0.9.7ubuntu4'
  2016-01-04 12:10:29,829 INFO python version: '3.4.3 (default, Mar 26 2015, 22:03:40) 
  [GCC 4.9.2]'
  2016-01-04 12:10:29,829 INFO release-upgrader version '15.10.14.2' started
  2016-01-04 12:10:29,913 INFO locale: 'de_DE' 'UTF-8'
  2016-01-04 12:10:30,015 DEBUG UI version is 4.0
  -----------------------------------------------------------------------------------------------------

  The file /var/log/dist-upgrade/apt-term.log ended with (sorry, my system is german and therefore the output from dpkg is, too. This is just a standard prompt for how dpkg should handle a changed config file):
  -----------------------------------------------------------------------------------------------------
  nginx-common (1.9.3-1ubuntu1) wird eingerichtet ...
  Neue Version der Konfigurationsdatei /etc/init.d/nginx wird installiert ...
  Neue Version der Konfigurationsdatei /etc/nginx/fastcgi.conf wird installiert ...
  Neue Version der Konfigurationsdatei /etc/nginx/fastcgi_params wird installiert ...

  Konfigurationsdatei »/etc/nginx/nginx.conf«
   ==> Geändert (von Ihnen oder von einem Skript) seit der Installation.
   ==> Paketverteiler hat eine aktualisierte Version herausgegeben.
     Wie möchten Sie vorgehen? Ihre Wahlmöglichkeiten sind:
      Y oder I : Die Version des Paket-Betreuers installieren
      N oder O : Die momentan installierte Version beibehalten
         D     : Die Unterschiede zwischen den Versionen anzeigen
         Z     : Eine Shell starten, um die Situation zu begutachten
   Der Standardweg ist das Beibehalten der momentanen Version.
  *** nginx.conf (Y/I/N/O/D/Z) [Vorgabe=N] ?
  ---------------------------------------------------------------------------------------------------

  I tried to finish the upgrade with
  sudo dpkg --configure --pending
  sudo apt-get dist-upgrade
  sudo apt-get autoremove

  We will see if this works after I reboot or not. Last time it didn't
  and I had to reinstall.

  This is the second time in a row that the release upgrade can not
  handle dpkg prompts. Please include a scenario with such prompts in
  your tests before doing a release. It really really sucks to run into
  this time and again. I hope next time I remember to run the command
  line upgrader instead of the graphical one.

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