synaptic crashes on launch

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Binary package hint: synaptic

1)
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=8.04
DISTRIB_CODENAME=hardy
DISTRIB_DESCRIPTION="Ubuntu hardy (development branch)"

                     0.61ubuntu6 Graphical package manager
2)

synaptic :
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Installed/Config-f/Unpacked/Failed-cfg/Half-inst/t-aWait/T-pend
|/ Err?=(none)/Hold/Reinst-required/X=both-problems (Status,Err: uppercase=bad)
||/ Nom Version Description
+++-==========================================-===============================-============================================
ii synaptic

4) launching synaptic.
5) after downloading the indexes, errors appeard, doesn't launche anymore , displaying error instead.
 synaptic errors:

Une erreur est survenue
Les détails suivant sont fournis :

E: Encountered a section with no Package: header
E: Problem with MergeList /var/lib/apt/lists/archive.ubuntu.com_ubuntu_dists_hardy_universe_i18n_Translation-fr
E: Impossible d'ouvrir ou d'analyser le fichier contenant la liste des états ou celui des paquets disponibles.
E: _cache->open() failed, please report.

ProblemType: Bug
Architecture: i386
Date: Sat Feb 23 21:51:36 2008
DistroRelease: Ubuntu 8.04
Package: synaptic 0.61ubuntu6
PackageArchitecture: i386
SourcePackage: synaptic
Uname: Linux box 2.6.24-8-generic #1 SMP Thu Feb 14 20:40:45 UTC 2008 i686 GNU/Linux