Update issue

I'm sure this has been addressed somewhere, but I'm having trouble finding it. I've just started using Ubuntu 9.10 so if this is an idiot question, that's my excuse (NOOB). Everything's going great except that I keep getting an update alert in my app panel and when I check for updates get the following:

Failed to fetch http://ppa.launchpad.net/awn-test/ppa/ubuntu/dists/karmic/main/binary-i3... 404 Not Found
Some index files failed to download, they have been ignored, or old ones used instead.

How do I fix this? Also can't seem to get the choppiness out of youtube videos. Appreciate your help.

It's not there

You probably need to update your sources. This ppa is the one you want for awn-trunk:
Instructions are there for adding the repository. Remove the old entry in "Software Sources". In Jaunty that's "System>Administration>Software Sources" -- "third party software" tab. Not sure if that's changed in Karmic.

Your flash issues are addressed here (if you're using Firefox):