First, you have to download the image file provided by Linuxium.

here: https://plus.google.com/+IanMORRISON/posts/gC5DB2zvWHk

Put on the USB key the ubuntu image.

Install Ubuntu 14.04

At restart, select option 2:

2 - Install Linux to NAND

Then (at the end of the process), remove the USB Key and press <return> to reboot.

Then choose 

1 - Boot Linux from NAND

You are on a ready to use Ubuntu 14.04 LTS

Login: linuxium / Pass: p

Then 

sudo su

Setup the network

This scenario covers the LAN network option (with RJ45 cable).

vim /etc/network/interfaces
## To configure a dynamic IP address
auto eth0
iface eth0 inet dhcp

Then, /etc/init.d/networking restart

dhclient eth0
ping 8.8.8.8
reboot

Install desktop (minimal xfce)

apt-get install --no-install-recommends xubuntu-desktop