Mine might be a bit dated, but you might be able to find one on eBay for pretty cheap now. I switched from an MBP 2013 to a ThinkPad T480 running Ubuntu 18.04 LTS back in July of 2018. Linux support has been really great and I didn't have to install a lot of special drivers. (e.g. trackpad support with multi-touch scrolling worked from the start)
Things to love about the T480:
- Fairly portable at around 3.5 lbs with a 14inch screen. It avoids the dedicated numeric keypad that some larger 15inch models have, while still having good screen real estate.
- Great keyboard as all Thinkpads have. (media keys are working great under linux)
- Very durable having undergone mil-spec testing.
- Camera placement at top with a mechanical shutter if you get the FHD screen.
- 32 GB of ram if you want/need it
- Hot-swappable batteries. No need to turn off the laptop. just flip it over and replace. (You can buy the extended 72Wh battery for extra battery time)