update-apt-xapian-index crashed with SystemError in open(): E:Encountered a section with no Package: header, E:Problem with MergeList /var/lib/apt/lists/fr.archive.ubuntu.com_ubuntu_dists_natty_main_binary-amd64_Packages, E:The package lists or status file could not be parsed or opened.

[Cob @FPGLaurent]

Binary package hint: apt-xapian-index

After an :
sudo rm /var/lib/apt/lists/* -vf
Caused by :
E:Encountered a section with no Package: header, E:Problem with MergeList

ProblemType: Crash
DistroRelease: Ubuntu 11.04
Package: apt-xapian-index 0.41ubuntu5
ProcVersionSignature: Ubuntu 2.6.38-5.32-generic 2.6.38-rc6
Uname: Linux 2.6.38-5-generic x86_64
Architecture: amd64
Date: Fri Feb 25 09:31:48 2011
ExecutablePath: /usr/sbin/update-apt-xapian-index
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Alpha amd64 (20110201.2)
InterpreterPath: /usr/bin/python2.7
PackageArchitecture: all
ProcCmdline: /usr/bin/python /usr/sbin/update-apt-xapian-index --update --quiet
ProcCwd: /
ProcEnviron:
 PATH=(custom, no user)
 SHELL=/bin/sh
PythonArgs: ['/usr/sbin/update-apt-xapian-index', '--update', '--quiet']
SourcePackage: apt-xapian-index
Title: update-apt-xapian-index crashed with SystemError in open(): E:Encountered a section with no Package: header, E:Problem with MergeList /var/lib/apt/lists/fr.archive.ubuntu.com_ubuntu_dists_natty_main_binary-amd64_Packages, E:The package lists or status file could not be parsed or opened.
UpgradeStatus: Upgraded to natty on 2011-02-18 (13 days ago)
UserGroups:

[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 #721797, 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.