$ sudo apt-get update
$ sudo apt-get install libfbclient2 

libfbclient2 is installed in your system.

Make ensure the libfbclient2 package were installed using the commands given below,

$ sudo dpkg-query -l | grep libfbclient2 *

You will get with libfbclient2 package name, version, architecture and description in a table

libfbclient2 package basic information: