$ sudo apt-get update
$ sudo apt-get install libgetdns1 

libgetdns1 is installed in your system.

Make ensure the libgetdns1 package were installed using the commands given below,

$ sudo dpkg-query -l | grep libgetdns1 *

You will get with libgetdns1 package name, version, architecture and description in a table

libgetdns1 package basic information: