update-manager crashed with SystemError in required_download(): E:Method has died unexpectedly!, E:Sub-process returned an error code (100), E:Method /usr/lib/apt/methods/ did not start correctly

[Enzo Lorenzo]

Binary package hint: update-manager

Since I Updated to Natty, the problem persists

ProblemType: Crash
DistroRelease: Ubuntu 11.04
Package: update-manager 1:0.147.6
ProcVersionSignature: Ubuntu 2.6.38-8.42-generic 2.6.38.2
Uname: Linux 2.6.38-8-generic i686
NonfreeKernelModules: nvidia
Architecture: i386
Date: Wed May 11 19:01:34 2011
ExecutablePath: /usr/bin/update-manager
InterpreterPath: /usr/bin/python2.7
PackageArchitecture: all
ProcCmdline: /usr/bin/python2.7 /usr/bin/update-manager --no-focus-on-map
ProcEnviron:
 LANGUAGE=es:en
 LANG=es_ES.utf8
 SHELL=/bin/bash
PythonArgs: ['/usr/bin/update-manager', '--no-focus-on-map']
SourcePackage: update-manager
Title: update-manager crashed with SystemError in required_download(): E:Method has died unexpectedly!, E:Sub-process returned an error code (100), E:Method /usr/lib/apt/methods/ did not start correctly
UpgradeStatus: Upgraded to natty on 2011-04-20 (21 days ago)
UserGroups: adm admin audio cdrom dialout dip disk fax floppy fuse lpadmin netdev plugdev sambashare tape video

[Apport retracing service (apport)]

Thank you for taking the time to report this crash and helping to make Ubuntu better. This particular crash has already been reported and is a duplicate of bug #764768, so 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.