$ sudo apt-get update
$ sudo apt-get install kolab-webadmin 

kolab-webadmin is installed in your system.

Make ensure the kolab-webadmin package were installed using the commands given below,

$ sudo dpkg-query -l | grep kolab-webadmin *

You will get with kolab-webadmin package name, version, architecture and description in a table

kolab-webadmin package basic information: