Thanks for your bugreport.

The following lines in the log indicate that there might be a problem with the 
backend daemon:
...
2012-03-17 16:25:15,849 - softwarecenter.backend - WARNING - _on_trans_error: 
org.freedesktop.DBus.Error.NoReply: Did not receive a reply. Possible causes 
include: the remote application did not send a reply, the message bus security 
policy blocked the reply, the reply timeout expired, or the network connection 
was broken.
...

Could you please attach /var/log/syslog to this file? 
Could you also please close software-center, then open a terminal and run:
$ sudo aptd --disable-timeout --replace --debug
and after that run software-center again and try to uninstall something again?

I'm interessted in the output of the terminal window that has the "aptd"
application running.

Thanks,
 Michael

** Changed in: software-center (Ubuntu)
       Status: New => Incomplete

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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to software-center in Ubuntu.
https://bugs.launchpad.net/bugs/958189

Title:
  Software Center locks up installs/uninstalls

Status in “software-center” package in Ubuntu:
  Incomplete

Bug description:
  I have just installed Ubuntu 11.10 and used the previous versions
  before when they contained the older archive manager for
  installing/uninstalling software. But for some reason I have been
  unable to uninstall a thing after the first day I've used Software
  Center. Normally I can figure out what I need to do but I've exhausted
  all ideas I can think of to try... it's just being a pain.

  ProblemType: Bug
  DistroRelease: Ubuntu 11.10
  Package: software-center 5.0.4
  ProcVersionSignature: Ubuntu 3.0.0-16.29-generic 3.0.20
  Uname: Linux 3.0.0-16-generic i686
  ApportVersion: 1.23-0ubuntu4
  Architecture: i386
  Date: Sat Mar 17 18:01:27 2012
  PackageArchitecture: all
  SourcePackage: software-center
  UpgradeStatus: No upgrade log present (probably fresh install)

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