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I have UBUNTU 12.04 LTS OS. Its not an image file/ISO image. I have searched a lot about how to make a pendrive bootable in order to install ubuntu, but everywhere they assume that I have ISO file. Even I've seen How to make bootable pendrive to install ubuntu os?. So I'm confused as I don't know how to get boot manager to make my pendrive bootable.

REMEMBER: My UBUNTU copy is NOT an ISO image file.

Simply copy-pasting those ubuntu files is not working.

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You should re-download the ISO from th Ubuntu website. If you got a copy that isn't an ISO, it's probably not the correct download, or even official, for that matter. – hexafraction Jan 7 '13 at 12:19
If what you have is not an ISO file... what do you have? – Eliah Kagan Jan 7 '13 at 12:19
@EliahKagan Its actually a folder containing all necessary files and folders where there is an wubi.exe installer file also – Biswajit Paul Jan 7 '13 at 12:22
ok @Catbuntu I will try, actually I've downloaded it from torrent. – Biswajit Paul Jan 7 '13 at 12:25

To install Ubuntu through an USB stick, you need to download the ISO image from here. Select 32-bit or 64-bit depending on if your processor is 64-bit capable, but if you choose 32-bit it will always work. See here for more information.

After downloading the ISO file, download and install PendriveLinux. Once it's installed, open it, and select your version of Ubuntu from the first dropdown menu:


After selecting it, click on the Browse button and select the ISO image you downloaded:


Finally, choose the USB drive (the letter; may be D:\, K:\, etc.) and click on the Create button:


Once it's burnt, just configure your BIOS to boot from the USB and install Ubuntu.

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Thanks, Its now working. – Biswajit Paul Jan 7 '13 at 12:49

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