I’ve found this simple solution works like a charm at first attempt . This solution I found at http://askubuntu.com/a/609199

Simple steps: Create wifi hotspot in ubuntu

  1. Disable Wifi (Uncheck Enable Wi-Fi)
  2. Go to network connection (Edit Connections…)
  3. Click “Add”
  4. Choose “Wi-Fi” and click “Create”
  5. Type in Connection name like “wifi-hotspot”
  6. Type in SSID as you wish
  7. Choose Device MAC Address from the dropdown (wlan0)
  8. Wifi Security select “WPA & WPA2 Personal” and set a password.
  9. Go to IPv4 Settings tab, from Method drop-down box select Shared to other computers.
  10. Then save and close.
  11. Open Terminal (Ctrl+Alt+T) and type in the following command with your connection name used in step 5.
    sudo gedit /etc/NetworkManager/system-connections/wifi-hotspot
  12. Find mode=infrastructure and change it to mode=ap
  13. Now check the network section where wi-fi will be connected to the created hotspot automatically. If you can not find it, go to Connect to Hidden Network… Find the connection and connect to it.