$ sudo apt-get update
$ sudo apt-get install libmessagecomposer4 

libmessagecomposer4 is installed in your system.

Make ensure the libmessagecomposer4 package were installed using the commands given below,

$ sudo dpkg-query -l | grep libmessagecomposer4 *

You will get with libmessagecomposer4 package name, version, architecture and description in a table

libmessagecomposer4 package basic information: