Apologies if this has been asked a million times - and also if this is in the wrong forum.

I work at a small pc store, and have convinced the owners to put ubuntu on a couple of machines and see if they sell.

What I need to know is,

What are our legal obligations to be able to sell machines preinstalled with ubuntu?

Can we get stickers to put on the cases (ubuntu inside?)

Can we get certified in some way?

Are there any promotional materials we can get (pdf download/print?)

Anything else we need to know before we put one on the shelf?

With baited breath..