$ sudo apt-get update
$ sudo apt-get install percona-xtrabackup 

percona-xtrabackup is installed in your system.

Make ensure the percona-xtrabackup package were installed using the commands given below,

$ sudo dpkg-query -l | grep percona-xtrabackup *

You will get with percona-xtrabackup package name, version, architecture and description in a table

percona-xtrabackup package basic information: