Public bug reported:

Hello,

Here is my configuration :

lsb_release -rd
Description:    Ubuntu 16.04 LTS
Release:        16.04

apt-cache policy synaptic 
synaptic:
  Installed: 0.83
  Candidate: 0.83
  Version table:
 *** 0.83 500
        500 http://ch.archive.ubuntu.com/ubuntu xenial/universe amd64 Packages
        100 /var/lib/dpkg/status

 uname -a
Linux mparchet-W240EU-W250EUQ-W270EUQ 4.4.0-22-generic #39-Ubuntu SMP Thu May 5 
16:53:32 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux

Problem :

When I open sysaptic, I get this message :

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

Could you help me to fix this bug ?

Best regards

Battant

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: synaptic 0.83
ProcVersionSignature: Ubuntu 4.4.0-22.39-generic 4.4.8
Uname: Linux 4.4.0-22-generic x86_64
ApportVersion: 2.20.1-0ubuntu2
Architecture: amd64
Date: Thu May 12 09:51:16 2016
ExecutablePath: /usr/sbin/synaptic
InstallationDate: Installed on 2015-10-01 (223 days ago)
InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
SourcePackage: synaptic
UpgradeStatus: Upgraded to xenial on 2016-04-26 (15 days ago)

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


** Tags: amd64 apport-bug third-party-packages xenial

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https://bugs.launchpad.net/bugs/1580911

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

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