Indian languages not suppoted in Ubuntu 16.04?

Use the Language Support in System Settings:

Click on the 'Install/Remove Languages' button:

Click the checkbox next to the language of your choice and click 'Apply'.

You can install related fonts. Like in your case you would need Indian fonts. From terminal:

sudo apt-get install fonts-indic

(Disclaimer: I'm not familiar with these languages)

Try system settings > language support, and check if the languages you need is fully installed. Sometimes some language packages may not be installed.

If that does not work, try to install fonts-knda for Kannada language and fonts-telu and see if that fix it. You can install from Synaptic or use this terminal command:

sudo apt install fonts-knda fonts-telu