Problem solved itself. After few days, distro upgrade worked well.
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https://bugs.launchpad.net/bugs/1241415
Title:
problem with sources during update
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Public bug reported:
ubuntu-minimal didn't found
ProblemType: Bug
DistroRelease: Ubuntu 13.04
Package: ubuntu-release-upgrader-core 1:0.192.13
ProcVersionSignature: Ubuntu 3.8.0-31.46-generic 3.8.13.8
Uname: Linux 3.8.0-31-generic i686
ApportVersion: 2.9.2-0ubuntu8.3
Architecture: i386
CrashDB: u
