My new laptop runs perfectly and I am very happy with it, except for the following problem.

Whenever I shutdown, the screen freezes at the Lenovo logo screen and fails to shutdown properly. Even after waiting several minutes, nothing happens. So in the end, I always have to hold in the power button for several seconds in order to get the laptop to complete the shutdown process properly.

I placed the following message in the Lenovo Support Forum.

I finally figured out what the problem was, I solved it by executing the following command:

sudo apt install nvidia-driver-535 nvidia-dkms-535

See: Ubuntu Linux Install Nvidia Driver (Latest Proprietary Driver)