beryl inst. prob. on ubuntu 6.06

Possibly... Have you tried from another connection? It could be that the repository was down or that there is an error in your /etc/apt/sources.list

Can you post the contents of that file and we can have a look. It might also be worth running through the steps again. I've had similar problems when I forgot to add the key.

It looks like you added a line to your sources.list that you were instead supposed to run.

1) Add only the line starting "deb" to your sources.list
2) Run the wget command (this downloads a "signature" for the new repository you added to sources.list so that when apt/aptitude tries to get files from here, it knows it's a "trusted source")
3) Continue with the guide, and you'll be in wobbly window heaven soon!

Edit: You were definitely barking up the right tree Audio, sorry to snipe your answer  

That was the giveaway that I missed.. :?

No problem. I think even I would have spotted that one had the OP posted the file.