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How do I know if a laptop will work with Ubuntu?

According to How to install hardware drivers for my laptop, the answer supplied by NorTicUs says:

"If your hardware as open drivers for Ubuntu, they will be install with Ubuntu. If there is driver from HP, you can find them into your Setting->Additional drivers.

This is Jockey, and it will let you know which drivers are available for your hardware. Just select which one you want and click Install."

But what if you do not already own the system, and you want to find out before you buy?