What's this

[gilles gallant]

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 couldn't
be verified because the public key is not available: NO_PUBKEY
4DA51AF64BD0ECAE

W: Failed to fetch
http://ppa.launchpad.net/ubuntuone/beta/ubuntu/dists/jaunty/Release

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



And when I try to update this pop's out.



Apt Authentication issue

Problem during package list update. The package list update failed with a
authentication failure. This usually happens behind a network proxy server.
Please try to click on the "Run this action now" button to correct the
problem or update the list manually by running Update Manager and clicking
on "Check".

I did all of the above but still doesn't work.
-- 
Please come back to me on this.

Thank you !
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