no pubkey?

Hi folks, I'm almost a complete noob.
I've just installed PinguyOS and I'm loving it.
However I keep getting this error when I try to download updates. The error say something about having "no pubkey" followed by a serial number
The updates appear to be installing but I'm not sure whether I need to do anything about this.
Help appreciated, John

You're not the only one to be getting this warning. Here is a discussion from the PinguyOS forum. They don't seem to take it very seriously.

Someone who uses Debian suggested that you could clear the problem up with the command apt-key update.

Thanks for the reply Hazel. I didn't realise PinguyOS had it's own forum. I shall seek it out. Much obliged, John:)