Public bug reported:

Following an upgrade from Precise to Trusty, a dreadful process,
Synaptic refuses to open, reporting:

E: The value 'precise-updates' is invalid for APT::Default-Release as such a 
release it not available in the sources
E: _cache->open() failed, please report.

I searched for this setting in /etc/apt/apt.conf.d/ but I can't see it
anywhere. In fact, an "fgrep -i precise /etc/*" reveals no remaining
mention of precise whatsoever.

Synaptic is now useless.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: synaptic 0.81.1ubuntu1
ProcVersionSignature: Ubuntu 4.2.0-18.22~14.04.1-generic 4.2.3
Uname: Linux 4.2.0-18-generic i686
ApportVersion: 2.14.1-0ubuntu3.19
Architecture: i386
CurrentDesktop: Unity
Date: Tue Dec  1 15:46:01 2015
SourcePackage: synaptic
UpgradeStatus: Upgraded to trusty on 2015-12-01 (0 days ago)

** Affects: synaptic (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: apport-bug i386 third-party-packages trusty

** Attachment added: "Error window"
   
https://bugs.launchpad.net/bugs/1521672/+attachment/4528014/+files/Screenshot%20from%202015-12-01%2015%3A46%3A52.png

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https://bugs.launchpad.net/bugs/1521672

Title:
  The value 'precise-updates' is invalid for APT::Default-Release

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