I Installed Wine like 3 weeeks ago, and now every time i try to install / update something I get this error:

Code:
W: GPG error: http://wine.budgetdedicated.com hardy Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 58403026387EE263
W: You may want to run apt-get update to correct these problems

I have been trying to Get an DVD to play on my Ubuntu today by installing Medibuntu, but it seems that I have failed.. I got an error and still DVD's wont play!