[Gutsy]Update is not working

[Nabeelfa]

Binary package hint: yelp

this is what it shows after I try to check the updates and it fails:
W: GPG error: http://sa.archive.ubuntu.com gutsy Release: The following signatures were invalid: BADSIG 40976EAF437D05B5 Ubuntu Archive Automatic Signing Key <email address hidden>
W: GPG error: http://sa.archive.ubuntu.com gutsy-updates Release: The following signatures were invalid: BADSIG 40976EAF437D05B5 Ubuntu Archive Automatic Signing Key <email address hidden>

ProblemType: Bug
Architecture: i386
Date: Mon Oct 22 00:25:32 2007
DistroRelease: Ubuntu 7.10
ExecutablePath: /usr/bin/yelp
NonfreeKernelModules: fglrx
Package: yelp 2.20.0-0ubuntu3
PackageArchitecture: i386
ProcCmdline: yelp
ProcCwd: /home/nabeel
ProcEnviron:
 PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: yelp
Uname: Linux nabeel-laptop-ubuntu 2.6.22-14-generic #1 SMP Sun Oct 14 23:05:12 GMT 2007 i686 GNU/Linux

[Sebastien Bacher (seb128)]

Thanks for your comments. This does not appear to be a bug report as such. We appreciate the difficulties you are facing, but it would make more sense to raise your question in the support tracker. http://launchpad.net/support

[Khurrum1990 (khurrum1990)]

Hi, I have been having the same problem for the last 2 days as well. It wasn't happening before so its very recent.

[Jube (julien-beltramo)]

'E:Le paquet dcp130ccupswrapper doit être réinstallé, mais je ne parviens pas à trouver son archive.'

[jdelima (jdelima307)]

same problem here with the following result, w/c i already sent to https://answers.edge.launchpad.net/ubuntu/+question/29821

E: /var/cache/apt/archives/update-manager_1%3a0.81.2_all.deb: Verification on package /var/cache/apt/archives/update-manager_1%3a0.81.2_all.deb failed!
E: /var/cache/apt/archives/update-manager-core_1%3a0.81.2_i386.deb: Verification on package /var/cache/apt/archives/update-manager-core_1%3a0.81.2_i386.deb failed!