HOW TO CREATE WIFI HOTSPOT IN UBUNTU??

1. Firstly disable WIFI and plug in an internet cable to your laptop (Brodband or cable from router).

2. Then, go to Network Icon on top panel > Edit Connections...... then click the Add button.

3. Then choose Wi-Fi from the drop-down menu - Choose a connection type- as shown in picture below:

4. After clicking create buton do:
    - Type in a connection name, SSID - (keep name as your wish, eg- wifi-hotspot)
    - Select mode: Infrastructure
    - Device MAC address: select your wireless card(MAC address) from drop-down menu.

5. Go to Wi-Fi Security tab, select security type WPA & WPA2 Personal(which is more secure than other security type) and set a password.

6. Then go to IPv4 Settings tab
    - from Method drop-down box select 'Shared to other computers'.
    - When done, click the save button.
    - After above steps, a configuration file created under /etc/NetworkManager/system-connections           directory. File name is same to the connection name you typed in step 4.

7. Now press Ctrl+Alt+T on keyboard to open terminal. When it opens, paste the commands below and hit enter to edit the configuration file: 

gksu gedit /etc/NetworkManager/system-connections/wifi-hotspot

8. Replace wifi-hotspt with the connection name you typed in step 4. When the file opens, find out the line mode=infrastructure and change it to mode=ap.

Finally save the file.

NOTE:
When everything’s done, enable WIFI from Network Manager icon on the panel.
It should automatically connect to the hotspot you created. If not, select “Connect to Hidden Wi-Fi Network …” and select it from the drop-down box.

If you cant configure, have a look at the video below to configure: