Finger print sensor doesn't work, the fans are super loud all the time, audio doesn't work (requires a newer Linux kernel than the one shipped in the latest Ubuntu), EFI problems, sleep, hibernate, fast-boot, restore from hibernate problems, battery life on Linux is horrible...
So at least the certification for Ubuntu is completely worthless. Reading the first comments in the Ubuntu forums from a year ago and the evolution of the Arch Wiki for my laptop, I have a hard time believing that somebody actually tested it before releasing the laptop. At best, somebody looked at the spec sheet and said "we have supported similar hardware before, this is good to go".
1 year later, the laptop is almost in a barely usable state. Canonical broke Audio support (soundcard not detected anymore) with 19.04 and did not fixed it before 20.04, essentially telling users to wait till the next Ubuntu release due to in 6 months. The only officially supported version is a 4 year old custom 16.04 that I never got the chance of trying, but this should tell you a lot about "long term" support of Canonical and Lenovo for these machines.
The only ones that should be getting any praise are the dozens of volunteers that have been screwed by both Lenovo and Canonical into buying one of these and have made their work and support time available to others for free.
If you want to buy a Linux laptop, avoid Lenovo like the plague. They have absolutely zero quality assurance for Linux.
EDIT: link to certification: https://certification.ubuntu.com/hardware/201906-27127
what a worthless bag of bytes.