[Bug 1036794] Re: unmet dependencies during update of nspr4: libnspr4 : Breaks: evolution-plugins (< 3.2.0-0ubuntu2) but 2.32.2-0ubuntu7 is to be installed

Thu Aug 16 10:32:52 UTC 2012

** Description changed:

  [Impact]
  An SRU of nspr to make CD-based upgrades work better from 10.04 to 12.04 has caused failures in other cases where users have continuously upgraded their systems from Ubuntu 9.04 or earlier and as a result have had old, obsolete evolution packages held back.  These users can now not upgrade at all using update-manager.

  [Test case]
  1. Fish an old Ubuntu 9.04 CD out of the drawer and install in English.  Make sure that the language-support-en package and language-support-translations-en are installed.
  2. Manually upgrade to 10.04.  Check that language-support-en is still installed.
  3. Run update-manager -d to upgrade to 12.04.  Verify that this upgrade fails.
  4. Enable -proposed, so that precise-proposed will be used in the upgrade to 12.04.
  5. Run update-manager -d again.  Verify that the upgrade now succeeds.

  Alternatively:
  1. Get a 12.04 chroot
- 2. Add natty and jaunty to /etc/apt/sources.list
+ 2. Add natty and jaunty (http://old-releases.ubuntu.com) to /etc/apt/sources.list
  3. sudo apt-get install evolution-plugins/natty evolution-common/natty libnspr4/natty language-support-translations-en/jaunty language-support-en/jaunty language-support-writing-en/jaunty
  4. Drop natty and jaunty from /etc/apt/sources.list
  5. Check that system is broken in apt-get -f install or apt-get dist-upgrade
  6. Get new libnspr4
  7. Upgrade now works, removing language-support-translations-en and language-support-en

  [Regression potential]
  The risk of regression here is difficult to quantify without an exhaustive examination of all historic packages in Ubuntu that depended on one or more of these now-obsolete language support packages.  Adding these Conflicts may result in other, different upgrade failures for yet another set of users.  What can be said is that any user affected by either this regression, or a regression resulting from this change, had obsolete packages installed which should be removed from their system; and the only effective way to identify any such remaining cases is by making the upgrade to 12.04 refuse to work until they've been dealt with.

  Could not calculate the upgrade

  An unresolvable problem occurred while calculating the upgrade.

  Please report this bug against the 'update-manager' package and include the following error message:
  'E:Error, pkgProblemResolver::Resolve generated breaks, this may be caused by held packages.'

  Package dependencies cannot be resolved

  This error could be caused by required additional software packages
  which are missing or not installable. Furthermore there could be a
  conflict between software packages which are not allowed to be installed
  at the same time.

  The following packages have unmet dependencies:

  libnspr4:

  Trace from Resolver:
  Investigating (9) libnspr4 [ i386 ] < 4.8.9-1ubuntu2 -> 4.8.9-1ubuntu2.1 > ( libs )
  Broken libnspr4:i386 Breaks on evolution-plugins [ i386 ] < 2.32.2-0ubuntu7 -> 3.2.3-0ubuntu6 > ( gnome ) (< 3.2.0-0ubuntu2)
    Considering evolution-plugins:i386 3 as a solution to libnspr4:i386 128
    Upgrading evolution-plugins:i386 due to Breaks field in libnspr4:i386
  Investigating (9) evolution-plugins [ i386 ] < 2.32.2-0ubuntu7 -> 3.2.3-0ubuntu6 > ( gnome )
  Broken evolution-plugins:i386 Depends on evolution [ i386 ] < none -> 3.2.3-0ubuntu6 > ( gnome ) (= 3.2.3-0ubuntu6)
    Considering evolution:i386 5 as a solution to evolution-plugins:i386 3
    Holding Back evolution-plugins:i386 rather than change evolution:i386
  Done
  Failed
  The following packages have unmet dependencies:
   libnspr4 : Breaks: evolution-plugins (< 3.2.0-0ubuntu2) but 2.32.2-0ubuntu7 is to be installed

  ----------------
  1. Description:	Ubuntu 12.04.1 LTS
  Release:	12.04
  ---------------
  2. apt-cache policy libnspr4
  libnspr4:
    Installed: 4.8.9-1ubuntu2
    Candidate: 4.8.9-1ubuntu2.1
    Version table:
       4.8.9-1ubuntu2.1 0
          500 http://us.archive.ubuntu.com/ubuntu/ precise-updates/main i386 Packages
   *** 4.8.9-1ubuntu2 0
          500 http://us.archive.ubuntu.com/ubuntu/ precise/main i386 Packages
          100 /var/lib/dpkg/status
  ----------------
  3. Update Manager should work properly

  4. Update Manager Could not calculate the upgrade

  An unresolvable problem occurred while calculating the upgrade.

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: update-manager 1:0.156.14.9
  ProcVersionSignature: Ubuntu 3.2.0-29.46-generic 3.2.24
  Uname: Linux 3.2.0-29-generic i686
  ApportVersion: 2.0.1-0ubuntu12
  Architecture: i386
  CurrentDmesg.txt:
   [   49.935139] r8169 0000:01:00.0: eth0: link up
   [   49.935343] ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
   [   51.500059] init: plymouth-stop pre-start process (1860) terminated with status 1
   [   59.560012] lxcbr0: no IPv6 routers present
   [   59.952011] eth0: no IPv6 routers present
  Date: Wed Aug 15 00:22:38 2012
  GsettingsChanges:
   com.ubuntu.update-manager first-run false
   com.ubuntu.update-manager launch-time 1344969604
   com.ubuntu.update-manager show-details true
   com.ubuntu.update-manager window-height 664
   com.ubuntu.update-manager window-width 525
  PackageArchitecture: all
  SourcePackage: update-manager
  UpgradeStatus: Upgraded to precise on 2012-03-09 (158 days ago)

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https://bugs.launchpad.net/bugs/1036794

Title:
  unmet dependencies during update of nspr4: libnspr4 : Breaks:
  evolution-plugins (< 3.2.0-0ubuntu2) but 2.32.2-0ubuntu7 is to be
  installed

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