What is the best notebook to run Ubuntu? [closed]

If I need a new notebook today and I go shopping, which notebook should I buy?

I mean: a notebook that supports Ubuntu 13.04 without any issue.

It hasn't to be the most powerful notebook. It must be Ubuntu 13.04 friendly.

Take a look at laptops that come with Ubuntu pre-installed, they are meant to be running Ubuntu out-of-the-box without any issue:

• System 76

• Dell with Ubuntu

There are others that offer Ubuntu pre installed, such as Think Penguim and ZaReason.

Although you'd better take a look at Certified Hardware by Ubuntu, the Desktop section (Yes, it also includes laptops) is a full list of laptops that are meant to run perfectly with Ubuntu.