$ sudo apt-get update
$ sudo apt-get install libcec-platform1v5 

libcec-platform1v5 is installed in your system.

Make ensure the libcec-platform1v5 package were installed using the commands given below,

$ sudo dpkg-query -l | grep libcec-platform1v5 *

You will get with libcec-platform1v5 package name, version, architecture and description in a table

libcec-platform1v5 package basic information: