Installing ubuntu from usb

Download the .iso to ~/downloads
Download UNetbootin to ~/downloads, from
http://sourceforge.net/project/downloading.php?groupname=unetbootin&filename=unetbootin-linux-313&use_mirror=ovh

sudo fdisk /dev/sdb # repartition usb.
sudo mkfs -t vfat /dev/sdb1 # reformat usb.
sudo mount /dev/sdb1 /media/usb # mount the new partition.
./unetbootin

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Note: AVOID fdisk! It is limited to 2TB MBR systems.