Internet becomes unavailible after connecting through vpn

Solution 1:

I think I have a solution. Please follow the procedure as mentioned below;

Open Network connection and click on VPN tab.
Click on VPN to be configured.
Now click on Edit
Go to IPV4/6 Settings
Click on Routes button
Now check the box in front of the text "Use the connections only for the resources on its network" (This will solve the problem of breakage of your internet connection)
Add a route using add button. (I am not expert in adding routes, so wont be able to help you out here. But this is the way, you would be able to add the routes).