update-manager: 'ascii' codec can't encode character u'\xf3'

Binary package hint: update-manager

When trying to fetch a package description:
Error Type: <type 'exceptions.UnicodeEncodeError'>
Error Value: 'ascii' codec can't encode character u'\xf3' in position 178: ordinal not in range(128)
  File : /usr/share/PackageKit/helpers/apt/aptBackend.py, line 2216, in <module>
    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 710, in dispatcher
    self.dispatch_command(args[0], args[1:])
  File : /usr/lib/python2.6/dist-packages/packagekit/backend.py, line 579, in dispatch_command
    self.get_update_detail(package_ids)
  File : /usr/share/PackageKit/helpers/apt/aptBackend.py, line 899, in get_update_detail
    updated)
  File : /usr/lib/python2.6/dist-packages/packagekit/backend.py, line 253, in update_detail
    print >> sys.stdout, "updatedetail\t$s\t$s\t$s\t$s\t$s\t$s\t$s\t$s\t$s\t$s\t$s\t$s" $ (package_id, updates, obsoletes, vendor_url, bugzilla_url, cve_url, restart, update_text, changelog, state, issued, updated)

ProblemType: Bug
DistroRelease: Ubuntu 10.04
Package: update-manager 1:0.134.7
ProcVersionSignature: Ubuntu 2.6.32-21.32-generic 2.6.32.11+drm33.2
Uname: Linux 2.6.32-21-generic i686
Architecture: i386
CheckboxSubmission: ccd722a04437518fafb9bb97609c94ba
CheckboxSystem: b633b4f40868d491c2ae5b50030ce6f3
Date: Tue Apr 27 08:36:00 2010
InstallationMedia: Ubuntu 10.04 "Lucid Lynx" - Alpha i386 (20100224.1)
PackageArchitecture: all
ProcEnviron:
 LANG=es_SV.UTF-8
 SHELL=/bin/bash
SourcePackage: update-manager