Some apps are not able to access internet when connected to Laptop's shared wifi on Ubuntu

In my office my mobile used to be connected to the office wifi. There I didn't face any internet problem, all apps work fine. But in my home my mobile is connected to my Laptop's shared wifi and Laptop is running on Kubuntu 15.10. In this case some apps like Play Store, youtube, telegram, whatsapp and all browsers, etc. work well, but some apps do not work, sometimes partially work or otherwise show the message 'No internet connection'. What's wrong with connection from my laptop to my mobile, and why are some apps working and some are not? How can I solve this?