It seems that Lenovo has been certifying their model for Ubuntu (probably for enterprise customers) for a quite a long time. There are a bit less models recently, but a few already have an Ubuntu 18.04 certification: https://certification.ubuntu.com/desktop/models/?query=&cate...
Recently my CPU broke down and I was "lucky" to try out the on-site warranty to replace my mainboard, which was not perfect (took a few days compared to the advertised "next business day"), but better compared to sending your stuff somewhere or searching your repair shop.
Also note that I do not use any nvidia graphics or 3d games. Just have not tried it and I know this could be a weak point. Videos etc work flawlessly though.
It is also no "free hardware" (bios etc). For an alternative in that regard I recommend to have a look into the nice Librem line from Purism: https://puri.sm/products/