$ sudo apt-get update
$ sudo apt-get install libxosd2 

libxosd2 is installed in your system.

Make ensure the libxosd2 package were installed using the commands given below,

$ sudo dpkg-query -l | grep libxosd2 *

You will get with libxosd2 package name, version, architecture and description in a table

libxosd2 package basic information: