update-manager crashed with Package libjson-c2 isn't available in _show_transaction()

[Coya DeBrojara]

Update-manager could not find the required files, because one source software has been disabled by the user. The program has unexpectedly stopped.
Performed the first update freshly installed system.

The problem is never repeated.

Update-manager nie mógł znaleźć wymaganego pliku, ponieważ jedno ze źródeł oprogramowanie zostało wyłączone przez użytkownika. Program uległ niespodziewanemu zatrzymaniu.
Przeprowadzano pierwszą aktualizację świeżo zainstalowanego systemu.
Problem się więcej nie powtórzył.

ProblemType: Crash
DistroRelease: Ubuntu 13.10
Package: update-manager 1:0.189
ProcVersionSignature: Ubuntu 3.10.0-2.11-generic 3.10.0
Uname: Linux 3.10.0-2-generic x86_64
ApportVersion: 2.10.2-0ubuntu4
Architecture: amd64
Date: Sat Jul 20 16:32:55 2013
EcryptfsInUse: Yes
ExecutablePath: /usr/bin/update-manager
GsettingsChanges:
 b'com.ubuntu.update-manager' b'first-run' b'false'
 b'com.ubuntu.update-manager' b'launch-time' b'1374330125'
 b'com.ubuntu.update-manager' b'show-details' b'true'
 b'com.ubuntu.update-manager' b'window-height' b'463'
 b'com.ubuntu.update-manager' b'window-width' b'848'
InstallationDate: Installed on 2013-07-20 (0 days ago)
InstallationMedia: Xubuntu 13.10 "Saucy Salamander" - Alpha amd64 (20130713)
InterpreterPath: /usr/bin/python3.3
MarkForUpload: True
PackageArchitecture: all
ProcCmdline: /usr/bin/python3 /usr/bin/update-manager --no-update --no-focus-on-map
ProcEnviron:
 LANGUAGE=pl
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=pl_PL.UTF-8
 SHELL=/bin/bash
PythonArgs: ['/usr/bin/update-manager', '--no-update', '--no-focus-on-map']
SourcePackage: update-manager
Title: update-manager crashed with Package libjson-c2 isn't available in _show_transaction()
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.