Apt Authentication issue on start up

[Dave]

Seeing the following error on start-up (and when reffreshing Synaptic Package Manager) on Easy Peasy 1.5:-

[quote]
W: A error occurred during the signature verification. The repository is not updated and the previous index files will be used.GPG error: http://gb.archive.ubuntu.com jaunty Release: The following signatures were invalid: BADSIG 40976EAF437D05B5 Ubuntu Archive Automatic Signing Key <email address hidden>

W: A error occurred during the signature verification. The repository is not updated and the previous index files will be used.GPG error: http://ppa.launchpad.net jaunty Release: The following signatures were invalid: BADSIG 3B22AB97AF1CDFA9 Launchpad PPA for Ubuntu-X

W: Failed to fetch http://gb.archive.ubuntu.com/ubuntu/dists/jaunty/Release

W: Failed to fetch http://ppa.launchpad.net/ubuntu-x-swat/x-updates/ubuntu/dists/jaunty/Release

W: Some index files failed to download, they have been ignored, or old ones used instead.
[/quote]