$ sudo apt-get update
$ sudo apt-get install libxfcegui4-4 

libxfcegui4-4 is installed in your system.

Make ensure the libxfcegui4-4 package were installed using the commands given below,

$ sudo dpkg-query -l | grep libxfcegui4-4 *

You will get with libxfcegui4-4 package name, version, architecture and description in a table

libxfcegui4-4 package basic information: