I run Ubuntu 19.04 on it and have so many problems.
- Grub has ridiculous performance issues on 4K screens, it renders at less than 1 fps, making it a real pain to do anything in it.
- You can't update the bios through Linux, the update tool is windows only.
- The Lenovo TB3 dock never works properly.
- The dual GPU situation (Intel + nVidia) requires all sorts of hacks to make it somewhat workable.
- The power usage is an abomination under Linux as it can't properly scale the nVidia GPU.
- Working with the TPM under Linux feels hacky, but maybe that's mostly due to my lack of experience and the lack of documentation.
OK, so all these problems are all due to my specific situation (running dual boot, and an external 4K display through the TB3 dock), but I really, really hope they start fixing these issues if they are going to officially support Ubuntu.
One plus though: due to the high power consumption under Linux, the coil whine is a lot less notable...