Ubuntu Software Center can't install ubuntu-restricted-extras package (untrusted packages)

[aysiu]

Binary package hint: software-center

If I try to install the ubuntu-restricted-extras package through the Ubuntu Software Center, I get a warning about how a package can't be authenticated (w32codecs, when I press the arrow to show more details).

After I click OK to proceed, instead of proceeding, the installation actually just aborts and returns to the ubuntu-restricted-extras package page instead of the installation screen.

ProblemType: Bug
Architecture: i386
Date: Fri Oct 30 11:47:41 2009
DistroRelease: Ubuntu 9.10
InstallationMedia: Ubuntu 9.10 "Karmic Koala" - Release i386 (20091028.5)
Package: software-center 1.0.2
PackageArchitecture: all
ProcEnviron:
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.31-14.48-generic
SourcePackage: software-center
Uname: Linux 2.6.31-14-generic i686

[aysiu (ubuntubugzilla-psychocats)]

Here is a screenshot of the warning.