[Level 3] Create bootable usb stick for Ubuntu.

If you want to create bootable usb stick to install Ubuntu,
please follow the steps below:
1. Download usb-creator package.
# apt-get -y install usb-creator
2. Run usb-creator.
# usb-creator-gtk
3. choose ISO image file.
4. create usb bootable stick.

Wish this helps.
regards,
Stanley Huang

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