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[Launchpad Bug Tracker <1509655@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package ubuntu-release-upgrader - 1:16.04.10

---------------
ubuntu-release-upgrader (1:16.04.10) xenial; urgency=medium

  [ Tim Lunn ]
  * DistUpgrade/DistUpgradeController.py: set a logind sleep inhibitor
  * DistUpgrade/DistUpgradeFetcher{KDE}.py: remove calls to inhibit_sleep
    logind inhibitor will be released when os.exec is called as we lose
    reference on the fd (LP: #1566141)

  [ Brian Murray ]
  * DistUpgrade/DistUpgradeViewKDE.py: Really fix call to showConffile.
    (LP: #1509655)

 -- Brian Murray <brian@xxxxxxxxxx>  Thu, 07 Apr 2016 15:26:25 -0700

** Changed in: ubuntu-release-upgrader (Ubuntu Xenial)
       Status: In Progress => Fix Released

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https://bugs.launchpad.net/bugs/1509655

Title:
  release upgrade crashed on custom configuration file dialog

Status in ubuntu-release-upgrader package in Ubuntu:
  Fix Released
Status in ubuntu-release-upgrader source package in Xenial:
  Fix Released

Bug description:
  On Kubuntu 15.04 amd64, while running installer to upgrade to 15.10,
  the GUI froze at 89% complete and /var/log/dist-upgrade/main.log ended
  with the stack trace below. I indeed have a custom server.xml
  configuration for Tomcat, so it looks like it crashes when it needs to
  show the configuration dialog (use maintainers/existing/diff).

  Yesterday on #kubuntu channel there was someone complaining about the
  same thing - his installer GUI froze at %80, and he found a similar
  stack trace in the log (I only know the last line of the trace was
  identical, didn't see the full stack trace). He said in his case it
  looks related to the sane (scanner package) custom configuration file
  dialog prompt.

  I think this is a pretty critical bug since an aborted OS upgrade is
  likely to render the system unusable for the average user, and it does
  little to encourage confidence of users in the OS distribution.

  
  2015-10-24 14:34:12,360 DEBUG got a conffile-prompt from dpkg for file: '/etc/tomcat7/server.xml'
  2015-10-24 14:34:12,362 DEBUG UI version is 4.0
  2015-10-24 14:34:12,362 DEBUG uiname is dialog_conffile
  2015-10-24 14:34:12,362 DEBUG toplevel widget is QDialog
  2015-10-24 14:34:12,362 DEBUG setting property geometry
  2015-10-24 14:34:12,362 DEBUG setting property windowTitle
  2015-10-24 14:34:12,362 DEBUG setting property modal
  2015-10-24 14:34:12,362 DEBUG push QDialog dialog_conffile
  2015-10-24 14:34:12,362 DEBUG push QGridLayout gridlayout
  2015-10-24 14:34:12,362 DEBUG setting property text
  2015-10-24 14:34:12,362 DEBUG push QPushButton show_difference_button
  2015-10-24 14:34:12,362 DEBUG pop widget QPushButton show_difference_button
  2015-10-24 14:34:12,362 DEBUG new topwidget <PyQt5.QtWidgets.QDialog object at 0x7fd6799e39d8>
  2015-10-24 14:34:12,362 DEBUG setting property sizePolicy
  2015-10-24 14:34:12,362 DEBUG setting property text
  2015-10-24 14:34:12,363 DEBUG setting property pixmap
  2015-10-24 14:34:12,363 DEBUG setting property wordWrap
  2015-10-24 14:34:12,363 DEBUG push QLabel textLabel2
  2015-10-24 14:34:12,363 DEBUG pop widget QLabel textLabel2
  2015-10-24 14:34:12,363 DEBUG new topwidget <PyQt5.QtWidgets.QDialog object at 0x7fd6799e39d8>
  2015-10-24 14:34:12,363 DEBUG setting property text
  2015-10-24 14:34:12,363 DEBUG setting property wordWrap
  2015-10-24 14:34:12,363 DEBUG push QLabel label_conffile
  2015-10-24 14:34:12,363 DEBUG pop widget QLabel label_conffile
  2015-10-24 14:34:12,363 DEBUG new topwidget <PyQt5.QtWidgets.QDialog object at 0x7fd6799e39d8>
  2015-10-24 14:34:12,363 DEBUG setting property text
  2015-10-24 14:34:12,363 DEBUG push QPushButton keep_button
  2015-10-24 14:34:12,363 DEBUG pop widget QPushButton keep_button
  2015-10-24 14:34:12,363 DEBUG new topwidget <PyQt5.QtWidgets.QDialog object at 0x7fd6799e39d8>
  2015-10-24 14:34:12,363 DEBUG setting property text
  2015-10-24 14:34:12,363 DEBUG push QPushButton replace_button
  2015-10-24 14:34:12,363 DEBUG pop widget QPushButton replace_button
  2015-10-24 14:34:12,363 DEBUG new topwidget <PyQt5.QtWidgets.QDialog object at 0x7fd6799e39d8>
  2015-10-24 14:34:12,364 DEBUG push QTextEdit textview_conffile
  2015-10-24 14:34:12,364 DEBUG pop widget QTextEdit textview_conffile
  2015-10-24 14:34:12,364 DEBUG new topwidget <PyQt5.QtWidgets.QDialog object at 0x7fd6799e39d8>
  2015-10-24 14:34:12,364 DEBUG pop layout QGridLayout gridlayout
  2015-10-24 14:34:12,364 DEBUG pop widget QDialog dialog_conffile
  2015-10-24 14:34:12,364 DEBUG new topwidget None
  2015-10-24 14:34:12,365 ERROR not handled exception in KDE frontend:
  Traceback (most recent call last):

    File "/tmp/ubuntu-release-upgrader-7bai3dvc/wily", line 8, in <module>
      sys.exit(main())

    File "/tmp/ubuntu-release-upgrader-7bai3dvc/DistUpgrade/DistUpgradeMain.py", line 240, in main
      if app.run():

    File "/tmp/ubuntu-release-upgrader-7bai3dvc/DistUpgrade/DistUpgradeController.py", line 1837, in run
      return self.fullUpgrade()

    File "/tmp/ubuntu-release-upgrader-7bai3dvc/DistUpgrade/DistUpgradeController.py", line 1802, in fullUpgrade
      if not self.doDistUpgrade():

    File "/tmp/ubuntu-release-upgrader-7bai3dvc/DistUpgrade/DistUpgradeController.py", line 1143, in doDistUpgrade
      res = self.cache.commit(fprogress,iprogress)

    File "/tmp/ubuntu-release-upgrader-7bai3dvc/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-7bai3dvc/DistUpgrade/DistUpgradeView.py", line 234, in run
      res = os.WEXITSTATUS(self.wait_child())

    File "/tmp/ubuntu-release-upgrader-7bai3dvc/DistUpgrade/DistUpgradeViewKDE.py", line 451, in wait_child
      self.update_interface()

    File "/tmp/ubuntu-release-upgrader-7bai3dvc/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-7bai3dvc/DistUpgrade/DistUpgradeViewKDE.py", line 339, in conffile
      self.confDialogue.show_difference_button.clicked.connect(self.showConffile())

  TypeError: argument 1 has unexpected type 'NoneType'

  2015-10-24 14:34:12,366 DEBUG running apport_crash()
  2015-10-24 14:34:12,393 DEBUG enabling apt cron job

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