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[Launchpad Bug Tracker <1485970@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package dbus - 1.8.12-1ubuntu6

---------------
dbus (1.8.12-1ubuntu6) wily; urgency=medium

  * debian/dbus.triggers: Switch trigger to interest-noawait to make life
    slightly easier on dpkg/apt while dependency unwinding (LP: #1485970)

 -- Adam Conrad <adconrad@xxxxxxxxxx>  Tue, 18 Aug 2015 12:37:46 -0600

** Changed in: dbus (Ubuntu)
       Status: Confirmed => Fix Released

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https://bugs.launchpad.net/bugs/1485970

Title:
  apt-get dist-upgrade falied with a dbus trigger loop due to an
  unconfigured library (libexpat1)

Status in dbus package in Ubuntu:
  Fix Released

Bug description:
  While attempting to upgrade from before the gcc-5 transition to after
  it apt-get dist-upgrade exploded in the middle.  It was attempting to
  handle dbus triggers but was unable to do so due to an unconfigured
  library, leading to a loop attempting to run the triggers and to the
  install failing in the middle:

    $ sudo apt-get dist-upgrade
    [...]
    Preparing to unpack .../libexpat1_2.1.0-7_amd64.deb ...
    De-configuring libexpat1:i386 (2.1.0-6ubuntu1) ...
    Unpacking libexpat1:amd64 (2.1.0-7) over (2.1.0-6ubuntu1) ...
    Preparing to unpack .../libexpat1_2.1.0-7_i386.deb ...
    Unpacking libexpat1:i386 (2.1.0-7) over (2.1.0-6ubuntu1) ...
    [...]
    Preparing to unpack .../systemd-sysv_224-1ubuntu3_amd64.deb ...
    Unpacking systemd-sysv (224-1ubuntu3) over (224-1ubuntu1) ...
    Processing triggers for man-db (2.7.0.2-5) ...
    dpkg: dependency problems prevent processing triggers for dbus:
     dbus depends on libexpat1 (>= 2.0.1); however:
      Package libexpat1:amd64 is not configured yet.

    dpkg: error processing package dbus (--configure):
     dependency problems - leaving triggers unprocessed
    dpkg: dependency problems prevent processing triggers for dbus:
     dbus depends on libexpat1 (>= 2.0.1); however:
      Package libexpat1:amd64 is not configured yet.
    [...]
    dpkg: too many errors, stopping
    Errors were encountered while processing:
     dbus
     dbus
    [...]
     dbus
     dbus
    Processing was halted because there were too many errors.

  An apt-get install -f was unable to make progress from the resulting
  situation simply repeating the dbus trigger loop.

  This was simply correctable (not simple to figure out, thank you
  cjwatson) by asking dpkg to configure libexpat1:

    $ sudo dpkg --configure libexpat1

  From there a sudo apt-get install -f, and then a sudo apt-get install
  ubuntu-desktop^ (mine was a desktop install) sorted me out.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: apt 1.0.9.10ubuntu6
  ProcVersionSignature: Ubuntu 4.1.0-3.3-generic 4.1.3
  Uname: Linux 4.1.0-3-generic x86_64
  NonfreeKernelModules: wl
  ApportVersion: 2.18-0ubuntu7
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Tue Aug 18 11:21:45 2015
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2013-06-20 (788 days ago)
  InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Alpha amd64 (20130618)
  SourcePackage: apt
  UpgradeStatus: Upgraded to wily on 2013-11-10 (645 days ago)

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