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I am new to Ubuntu. How can I clean Install Ubuntu to a Laptop without a CD Rom and if I put ISO file in a Flashdrive how it works when booting up?

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marked as duplicate by Mitch, Eric Carvalho, Basharat Sialvi, Radu Rădeanu, gertvdijk Jun 23 '13 at 22:05

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

Do you have an existing OS now? – Mitch Jun 23 '13 at 9:32
I do not have a OS now, so I can not use UNetbootin – Chandima Jun 24 '13 at 15:00
Unfortunately you have to create the USB on a different machine, one that has an OS. – Mitch Jun 24 '13 at 15:06

You can use UNetbootin. Download it, make sure you have no external USB drives plugged in except the one you want to use for installing Ubuntu, and launch UNetbootin.

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Select Ubuntu, the version of Ubuntu you want (select 12.04_Live for the long term support version, or 13.04_Live for the most recent version) and click OK. Then wait until it's done.

You then can boot from that USB drive and then you can try or install Ubuntu!

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