$ sudo apt-get update
$ sudo apt-get install libunixsocket-java 

libunixsocket-java is installed in your system.

Make ensure the libunixsocket-java package were installed using the commands given below,

$ sudo dpkg-query -l | grep libunixsocket-java *

You will get with libunixsocket-java package name, version, architecture and description in a table

libunixsocket-java package basic information: