With the newer version of Ubuntu, the built in function that creates a Hotspot may not work properly on a Lenovo laptop.
The way around it is to use ap-hotspot.
sudo add-apt-repository ppa:nilarimogard/webupd8 sudo apt-get update sudo apt-get install ap-hotspot
To start or stop ap-hotspot
sudo ap-hotspot start sudo ap-hotspot stop
To configure it
sudo ap-hotspot configure