Its Pretty easy to create Hotspot in Ubuntu and Ubuntu based distributions. Following This article will help you easily create Hotspot
https://ubuntuhandbook.org/index.php/2014/09/3-ways-create-wifi-hotspot-ubuntu/
you are Lucky if you are done in first run. But if you found “AP Mode Not Supported” Message. you need to dig-in like me. its driver issue. all you need to hunt for correct drivers. Follow article linked Below
https://ubuntuhandbook.org/index.php/2014/09/wifi-hotspot-access-point-not-supported/
Follow Step 1 to Step 7.
If you don’t found your Drivers in Additional Drivers, make sure you are done with 7th Step, restart the PC.
Remove Existing Driver
sudo modprobe -r wl
Load Newly installed one.
sudo modprobe brcmsmac
Repeat Step 3, Check current driver running on your wifi adapter by running below command
ethtool -i wlan0 | grep driver
Should Not Result like (Any thing apart from this is most welcome)
driver: wl0
You are ready to Create Hotspot with steps mentioned in Ubuntu Handbook.