To install Ubuntu/Lubuntu or many Linux distros from USB stick, in this post, I will show you how to create bootable Ubuntu USB from ISO file.
Step 1: Download the ISO file
For Ubuntu server, you can go to https://www.ubuntu.com/download/server and download desired version of Ubuntu as an ISO file to you hard disk.
Step 2: Download Universal USB Software
Step 3: Plugin USB stick and start Universal USB
You will need recommended 8GB USB Stick, start Universal USB, you will got screen like this.
First select Ubuntu as Linux distribution you need, second, select location of downloaded ISO file. Third, select USB stick/flash drive and press Create.
Note: All data in the USB will be swept away, so please take care of your data before processing.