I believe my Core Duo 2 laptop (Inspiron 1420) is the model Dell set up with Ubuntu. Got it on eBay for $800 from person who lightly used it but didn't want Linux. It's about 8 years old or something. Still handles about anything I throw at it from web servers to video to virtual machines. 1080p seems to be rough on it but I can't tell if it's it or Linux-related software. 720p looks great on it, though, so I question the necessity of 1080p anyway.

Things run a bit slower for the apps that get unnecessarily bloated over time. Including some websites. Still fast enough day to day to not really matter. I was used to it about 3-4 years ago. Thanks to software improvements, my laptop actually got better over the years. ;)