[Bug 1547837] Re: release upgrade to wily freezes on dpkg's first configuration file question

[Ubuntu Foundations Team Bug Bot]

** Tags added: vivid2wily

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https://bugs.launchpad.net/bugs/1547837

Title:
  release upgrade to wily freezes on dpkg's first configuration file
  question

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

Bug description:
  Started the graphical upgrade to wily; packages downloaded and apt
  started to install. After a while, the UI froze (no redraw). in
  /var/log/dist-upgrade/apt-term.log, the following is displayed:

  =====
  [...]
  Neue Version der Konfigurationsdatei /etc/init.d/mountnfs-bootclean.sh wird installiert ...
  Neue Version der Konfigurationsdatei /etc/init.d/mountdevsubfs.sh wird installiert ...
  Neue Version der Konfigurationsdatei /etc/init.d/mountkernfs.sh wird installiert ...

  Konfigurationsdatei »/etc/init.d/ondemand«
   ==> 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.
  *** ondemand (Y/I/N/O/D/Z) [Vorgabe=N] ?
  =====

  Normally, an interactive dialogue is supposed to open, but no such
  thing happened.

  pstree excerpt:
           ├─wily(4352)───dpkg(17611)

  strace shows dpkg hanging on reading from stdin:
  # strace -p 17611
  Process 17611 attached
  read(0, ^CProcess 17611 detached
   <detached ...>
  #

  Writing "I\n" to /proc/17611/fd/0 did appear in the log, but didn't
  help (dpkg still stuck). Had to kill it and continue the upgrade on
  foot.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: ubuntu-release-upgrader-core 1:15.04.14.3
  ProcVersionSignature: Ubuntu 3.19.0-49.55-generic 3.19.8-ckt12
  Uname: Linux 3.19.0-49-generic x86_64
  NonfreeKernelModules: zfs zunicode zcommon znvpair zavl
  ApportVersion: 2.17.2-0ubuntu1.8
  Architecture: amd64
  CrashDB: ubuntu
  Date: Sat Feb 20 12:18:42 2016
  InstallationDate: Installed on 2012-01-03 (1508 days ago)
  InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release i386 (20111012)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  Symptom: dist-upgrade
  UpgradeStatus: Upgraded to wily on 2016-02-20 (0 days ago)

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