$ sudo apt-get update
$ sudo apt-get install libfileclasses1 

libfileclasses1 is installed in your system.

Make ensure the libfileclasses1 package were installed using the commands given below,

$ sudo dpkg-query -l | grep libfileclasses1 *

You will get with libfileclasses1 package name, version, architecture and description in a table

libfileclasses1 package basic information: