How I could use lab
The Overview section of lab exercise 3.1 describes the requirements of the lab environment. Feel free to either use a cloud IaaS provider or a local hypervisor to setup the environment.
I have installed vmware and centos, the lab 3.1 worked with ubuntu the download is apt-get or wget
That is correct, in Ubuntu apt-get is the tool to download and install software packages directly from the OS source repositories, while wget and curl allow for software packages to be downloaded via URLs.