Comment 0 for bug 978821

E: Значение «oneiric» недопустимо для APT::Default-Release, так как выпуск недоступен в источниках
E: _cache->open() failed, please report.

But:

$ sudo grep -r oneiric /etc/apt | wc -l
0
$

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: synaptic 0.75.9
ProcVersionSignature: Ubuntu 3.2.0-22.35-generic 3.2.14
Uname: Linux 3.2.0-22-generic x86_64
ApportVersion: 2.0.1-0ubuntu1
Architecture: amd64
Date: Wed Apr 11 14:58:52 2012
InstallationMedia: Ubuntu 9.10 "Karmic Koala" - Release amd64 (20091027.1)
SourcePackage: synaptic
UpgradeStatus: Upgraded to precise on 2012-03-30 (11 days ago)