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I'm trying to install Ubuntu 12.04 using live USB but getting error message that my CD or DVD drive lens is needed to be clean or I have burnt CD at higher speed. Why I'm facing this problem as I'm using a Live USB, How can I get through it. I want to install it on my hard disk.

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You'll have to check you memory using a memtest. Also, check the .iso image using instructions here:

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sorry i'm new to ubuntu and don't know how to open terminal and go to a directory. Please help me regarding this. secondly I dont have .iso image, I only have image at live usb – Zain Mustafa Apr 27 '12 at 0:04
Such errors usually indicate that some files on the Live CD/USB are corrupted. Since you use a USB, the files may have been corrupted while downloading. If you don't have the .iso image, please download it, and then check its integrity. – mikewhatever Apr 27 '12 at 0:09
it means I have to install windows first, then download .iso image!!! Will this method work for sure? – Zain Mustafa Apr 27 '12 at 0:13
You can download the image using the live USB. Boot from the USB stick and select "Try Ubuntu". Open Firefox and go to download the .iso, but make sure you download it to another USB stick or hard disk and not to any of the live CD's home folder directories, to ensure you don't run out of RAM and crash. You can also use the bittorrent downloads using this guide [ ] to make sure you don't get any data flaws. – Richard Apr 27 '12 at 12:44

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