To add some more useful (anecdotal) data, I have a Thinkpad T15 with Ubuntu 20.04 and everything works smoothly (even secure boot) EXCEPT the fingerprints reader, although TBH I still haven't tried after updating to 20.04. So in my opinion Lenovo support for Ubuntu is really good.
You can have a more than decent Lenovo laptop for half that price (T490) and TBH fingerprint reader is a nice gimmick but it's not something I care when I choose a laptop.
To add some more useful (anecdotal) data, I have a Thinkpad T15 with Ubuntu 20.04 and everything works smoothly (even secure boot) EXCEPT the fingerprints reader, although TBH I still haven't tried after updating to 20.04. So in my opinion Lenovo support for Ubuntu is really good.