[Wine] Signing Key error after upgrading to Unbuntu 10.04

[Tootler]

I have just upgraded Ubuntu to 10.04 and I went to update the Wine repository to match.

I copied and entered the ppa into the software sources and selected Reload and Close and I got the following error message


Code:
W: GPG error: http://ppa.launchpad.net lucid Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 5A9A06AEF9CB8DB0



What is the significance of this and what problems might it bring?

I don't want to try upgrading then find I have problems.

Geoff