If you can still find one on then used market, I'll put in a plug for the Lenovo X1C 4th Gen (2016 model) as an ideal Linux laptop. It's what I switched to after the x220, and I describe it here:
I recently switched to a X1C6, and I wholly agree. It's an amazing laptop in terms of hardware and build quality, but it does have a bunch of Linux compatibility problems.
The trackpad didn't work out of the box, I had to change some settings; annoying, but no big deal. What's a bigger problem is that the trackpad buttons don't work after suspending/hibernating, and I still haven't been able to fix that. Also, the fingerprint reader and NFC do not have any drivers on Linux.
The Arch wiki page[1] has been tremendously helpful in getting set up. However, I think the length of the article goes some way toward showing that compatibility is far from perfect.
The trackpad / NFC issues seem to only be present on laptops with NFC behind the trackpad, so my recommendation would be to avoid that one if it's possible to get a similar model without.
Seconded. I had an X1C2 and am currently on an X1C5. Everything works out of the box on linux and the performance is crazy for something so thin & light (2.8lbs).
https://amontalenti.com/2017/09/01/lenovo-linux
Fan never turns on, matte display, awesome connectivity, great battery life, and everything on Linux just works.