Lenovo Computers & Linux.

I can tell from experience (current) that ThinkPads and Linux work quite well. I have a T490s and I use Debian 10.5 on bare metal as "my daily driver".

Installed using the images that ship the non-free software, it works like a charm. Also, the UEFI these machines have is recent enough and standard enough to be able to use it in full with Linux (i.e., including the Secure Boot with the distributions that support it).

Be aware
Please note that for pre-installed systems:

1. The system is available in some regions with a special image of Ubuntu pre-installed by the manufacturer. It takes advantage of the hardware features for this system and may include additional software. You should check when buying the system whether this is an option.
2. Standard images of Ubuntu may not work at all on the system or may not work well, though Canonical and computer manufacturers will try to certify the system with future standard releases of Ubuntu.

from :https://certification.ubuntu.com/hardware/202004-27803
....which in turn came from : https://support.lenovo.com/au/en/solutions/pd031426

I would take the Lenovo support list thing with a HUGE grain of salt. For instance, they list Ubuntu 12.04 for a T440p. In reality, a T440p will run any *buntu up to and including the current 20.04.