Version:           0.3.1 (using KDE 4.5.3) 
OS:                Linux

Today I've received eleven security updates and eight bug-fixes via the daily kpackage-kits search for updates. After I've installed them I clicked to update again (I do this allways, to make sure I've got all Updates) the following report appeared:
Unexpected internal system error occured, please report that bug
Details
Error Type: 
Error Value: coercing to Unicode: need string or buffer, exceptions.SystemError found
File : /usr/share/PackageKit/helpers/apt/aptBackend.py, line 2216, in 
main()
File : /usr/share/PackageKit/helpers/apt/aptBackend.py, line 2213, in main
run(args, options.single)
File : /usr/share/PackageKit/helpers/apt/aptBackend.py, line 2175, in run
backend.dispatcher(args)
File : /usr/lib/python2.6/dist-packages/packagekit/backend.py, line 699, in dispatcher
self.dispatch_command(args[0], args[1:])
File : /usr/lib/python2.6/dist-packages/packagekit/backend.py, line 606, in dispatch_command
self.refresh_cache(force)
File : /usr/share/PackageKit/helpers/apt/aptBackend.py, line 202, in _locked_cache
func(*args, **kwargs)
File : /usr/share/PackageKit/helpers/apt/aptBackend.py, line 1498, in refresh_cache
format_string(error.message))
File : /usr/lib/python2.6/dist-packages/packagekit/backend.py, line 723, in format_string
txt = unicode(text, encoding, errors='replace')


Reproducible: Always

Steps to Reproduce:
I restarted the computer than > kickoff > applications > system > kpackagekit > software updates > check for new updates

Actual Results:  
see details

Expected Results:  
KPackage Kit searches for updates and show them (if available) to take a coice and apply them otherwise no output.

OS: Linux (i686) release 2.6.32-28-generic
Compiler: cc
Distribution:Kubuntu 10.04.2 with KDE 4.5.3