$ sudo apt-get update
$ sudo apt-get install fonts-lohit-taml-classical 

fonts-lohit-taml-classical is installed in your system.

Make ensure the fonts-lohit-taml-classical package were installed using the commands given below,

$ sudo dpkg-query -l | grep fonts-lohit-taml-classical *

You will get with fonts-lohit-taml-classical package name, version, architecture and description in a table

fonts-lohit-taml-classical package basic information: