synaptic report a warning with "Select updates" button

[efa]

Binary package hint: synaptic

from the last update, everytime I press the "Select updates" button, I got the Warning:

W: Duplicate sources.list entry http://archive.canonical.com/ubuntu/ lucid/partner Packages (/var/lib/apt/lists/archive.canonical.com_ubuntu_dists_lucid_partner_binary-i386_Packages)

ProblemType: Bug
DistroRelease: Ubuntu 10.04
Package: synaptic 0.63.1ubuntu7
ProcVersionSignature: Ubuntu 2.6.32-25.45-generic 2.6.32.21+drm33.7
Uname: Linux 2.6.32-25-generic i686
Architecture: i386
CheckboxSubmission: 1025977719eeebebe5648c8ca87056aa
CheckboxSystem: 533a8038ef5a55601694b49142442fa7
Date: Sat Nov 27 00:48:53 2010
ProcEnviron:
 LANGUAGE=it_IT:it:en_GB:en
 PATH=(custom, user)
 LANG=it_IT.utf8
 SHELL=/bin/bash
SourcePackage: synaptic

[efa (efa)]

/var/lib/apt/lists$ grep Package: archive.canonical.com_ubuntu_dists_lucid_partner_binary-i386_Packages | uniq -d

output nothing

[efa (efa)]

while:
/var/lib/apt/lists$ grep Source: archive.canonical.com_ubuntu_dists_lucid_partner_binary-i386_Packages | uniq -d
Source: swftools
Source: sun-java6
Source: arkeia
Source: zarafa

but I think the source can be duplicated for different packages

[dino99 (9d9)]

That version is too old and no more maintained

[efa (efa)]

about what happened with all bugs I reported.
A new version come out before you fix the trouble, then the bug are marked as invalid.
I stopped reporting because made no difference, then switched to debian