$ sudo apt-get update
$ sudo apt-get install libdvbcsa1 

libdvbcsa1 is installed in your system.

Make ensure the libdvbcsa1 package were installed using the commands given below,

$ sudo dpkg-query -l | grep libdvbcsa1 *

You will get with libdvbcsa1 package name, version, architecture and description in a table

libdvbcsa1 package basic information: