> Dell officially supports Ubuntu...

Meh. I'm writing this from an Asus EeePC which was once officially supported by Ubuntu, but now with broken graphics and wifi.

The non-free graphics driver is not included in Ubuntu anymore and the wifi works only with non-free binary blob.

Also, I recently found that wifi doesn't support channel 13 and 14 (found it accidentally when my laptop wasn't seeing the nearby hotspot) with the non-free blob. Now I run Debian testing.

Don't trust in those "Officially supported" things, unless it's Debian GNU/Linux. Otherwise, it's eventually going to be broken.