update manager very slowly removes installed packages after install

[Ken Pratt]

When there is a large number of updates reported via the update-manager and you shoose to install them all, they are removed from the list one at a time very slowly after all packages have been installed. This happend frequently as I keep my 12.04 Beta up-2-date.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: update-manager 1:0.156.9
ProcVersionSignature: Ubuntu 3.2.0-19.30-generic 3.2.11
Uname: Linux 3.2.0-19-generic x86_64
ApportVersion: 1.94.1-0ubuntu2
Architecture: amd64
Date: Wed Mar 21 18:27:56 2012
GsettingsChanges:
 com.ubuntu.update-manager first-run false
 com.ubuntu.update-manager launch-time 1332331914
 com.ubuntu.update-manager show-details true
 com.ubuntu.update-manager window-height 670
 com.ubuntu.update-manager window-width 600
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Alpha amd64 (20120112)
PackageArchitecture: all
ProcEnviron:
 TERM=xterm
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: update-manager
UpgradeStatus: Upgraded to precise on 2012-03-10 (10 days ago)

[Jean-Baptiste Lallement (jibel)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. This particular bug has already been reported and is a duplicate of bug 945536, so it is being marked as such. Please look at the other bug report to see if there is any missing information that you can provide, or to see if there is a workaround for the bug. Additionally, any further discussion regarding the bug should occur in the other report. Please continue to report any other bugs you may find.