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I have HP Pavilion g6 laptop. I tried installing ubuntu on it. i successfully downloaded the image and copied it to disc. now i do not understand how to run the setup while my laptop do not boot from that disc. Please help me.

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Did you write the ISO to the disc or what?? Wht are the contents of the disc?? – Akshit Baunthiyal Jul 16 '12 at 7:02
You need to burn it as an iso - not copy it. – 23 93 26 35 19 57 3 89 Jul 16 '12 at 7:38
Alternatively you can also burn or install it to a USB drive and set your BIOS to boot into the USB device. – Peachy Jul 16 '12 at 8:02

As said by the posters above, check first you've burned the ISO to the disc, not copied it. Otherwise on HP laptops you may have to choose the boot order (on mine I did it by pressing Escape right at startup) and select your CD/DVD Rom Drive so that it boots from the CD rather than your already existing Hard Drive.

Alternatively as pointed out by msPeachy:

I've been installing different versions for the past week and I've found running the installation off a USB worked fine for me, if you want to give it a try just get the ISO which you've already got from what I've read and use:

Make sure your USB is free to be reformatted and has enough space (anything on it will be deleted) and leave it plugged in, once you restart your computer you should have an option at some point to access the boot menu (on my HP pavillion it was "Esc" and there you choose to Boot from your USB instead of your hard drive)

Also I'd suggest you change the Boot Order in the Boot Menu and not the Bios Setup so that once you've restarted your Laptop with Ubuntu, you don't have to change it back (otherwise your laptop will try restart from a USB everytime). This is just my experience on my HP pavillion, suppose it'd be similar for you.

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