I can't start Ubuntu Software Center

[Gevorg Hindoyan]

When I try to open software center, it doesn't open. And computer starts to hang. But than I tried to get some information about what happening, and I run software center from terminal, it gave this output:
 Fontconfig warning: "/etc/fonts/conf.d/50-user.conf", line 9: reading configurations from ~/.fonts.conf is deprecated.
2012-12-23 15:55:18,554 - softwarecenter.ui.gtk3.app - INFO - setting up proxy 'None'
2012-12-23 15:55:19,000 - softwarecenter.db.database - INFO - open() database: path=None use_axi=True use_agent=True
And after that it just hangs... I tried to look up for that process, and wrote in terminal: "ps -edf | grep soft" and got process id that was running, and that was:
gevorg 12336 11029 1 18:17 pts/4 00:00:01 /usr/bin/python /usr/bin/software-center
and I killed it.
More information:
1) my release information is:
Description: Ubuntu 12.10
Release: 12.10
2) package version information:
software-center:
  Installed: 5.4.1.2
  Candidate: 5.4.1.2
  Version table:
 *** 5.4.1.2 0
        500 http://am.archive.ubuntu.com/ubuntu/ quantal/main i386 Packages
        100 /var/lib/dpkg/status
3)I expected that software center will start
4)It haven't started, and now I can only install software via "apt-get"

ProblemType: Bug
DistroRelease: Ubuntu 12.10
Package: software-center 5.4.1.2
ProcVersionSignature: Ubuntu 3.5.0-21.32-generic 3.5.7.1
Uname: Linux 3.5.0-21-generic i686
ApportVersion: 2.6.1-0ubuntu9
Architecture: i386
Date: Sun Dec 23 21:18:43 2012
InstallationDate: Installed on 2012-09-27 (87 days ago)
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release i386 (20120423)
MarkForUpload: True
PackageArchitecture: all
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: software-center
UpgradeStatus: Upgraded to quantal on 2012-10-19 (65 days ago)

[dino99 (9d9)]

That version is no more maintained