$ sudo apt-get update
$ sudo apt-get install libc-ares2 

libc-ares2 is installed in your system.

Make ensure the libc-ares2 package were installed using the commands given below,

$ sudo dpkg-query -l | grep libc-ares2 *

You will get with libc-ares2 package name, version, architecture and description in a table

libc-ares2 package basic information: