I just got a Dell 15N. I'm little peeved at Dell because the Windows version was put on sale but the Linux version was not. I bought the Windows one because it was 100$ cheaper and installed Ubuntu on it, which I'm now using with Chrome.(Chrome finally has a stable Linux version!)
For anybody doing likewise the automatic dual boot option leaves a tiny half a gig of the drive for Ubuntu. I have since changed that to 60 Gigs without any problems with the Windows part.
By the way I made the above graphic with a Linux program called Gimp. One of the many FREE programs Linux offers. (I'm not worried about the Flash 10 security problem because they still don't have a 64bit version that works for Linux!)
The Alpha version of 64-bit Flash 10 works fine, now.
I use a wrapper on 64bit machines to run 32bit Flash. While I don't use Ubuntu very often (generally I run Fedora), I believe that from looking around the web that the relevant Ubuntu package is flashplugin-nonfree. (There's a webpage here that mentions this solution.)