upgrade to 13.04

[Wang Jun]

When preparing to upgrade, it failed.

ProblemType: Bug
DistroRelease: Ubuntu 12.10
Package: ubuntu-release-upgrader-core 1:0.190.6
ProcVersionSignature: Ubuntu 3.5.0-27.46-generic 3.5.7.7
Uname: Linux 3.5.0-27-generic x86_64
ApportVersion: 2.6.1-0ubuntu10
Architecture: amd64
Date: Tue May 28 10:29:46 2013
InstallationDate: Installed on 2012-07-16 (315 days ago)
InstallationMedia: Kubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120423)
MarkForUpload: True
PackageArchitecture: all
ProcEnviron:
 LANGUAGE=zh_CN:zh
 TERM=unknown
 PATH=(custom, no user)
 LANG=zh_CN.UTF-8
 SHELL=/bin/bash
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to quantal on 2013-05-28 (0 days ago)
VarLogDistupgradeTermlog: