I had saw errors while installing Ubuntu 18.04 LTS, also it was freezing in the middle of the installation steps. Then I installed popos which is based on Ubuntu 18.04 LTS (and which already includes nvidia drivers) https://system76.com/pop. It works very well.
For me
1) Touchpad does not work at all, I am still looking for a solution
2) Keyboard backlit works with the default blue color, I have not found a way to control the backlit yet
3) Fans work fine, turbo button works fine as well.
4) No screen flickering issue
So far, the biggest issue is the touchpad, pity that it is not possible to use the touchpad
For me
1) Touchpad does not work at all, I am still looking for a solution
2) Keyboard backlit works with the default blue color, I have not found a way to control the backlit yet
3) Fans work fine, turbo button works fine as well.
4) No screen flickering issue
So far, the biggest issue is the touchpad, pity that it is not possible to use the touchpad