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Every now and then new versions of os are released. I want to try them out but what I don't want to have to burn a new CD/DVD or create a bootable USB, every time.

I don't want to use usb or cd/dvd.

How can we install an iso from grub when the computer starts?

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Have a look at this it might help you accomplish just what you want. – Mitch May 14 '13 at 18:33
1 – Joe May 14 '13 at 18:48
That's even better :) – Mitch May 14 '13 at 18:50

im going to guess you are trying to install without a disc, im my experience the iso mounting occurs when the system loads and its after grub, may i suggest opening or mounting the iso and copying the files onto a USB, that should work, oh and make sure the partition settings of the usb are the same, eg the partition can be booted.

If yyou are trying to instyall ubuntu, may i suggest the [Startup Disk Creator] App, ive never tried it but ive heard of it and can see it

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I tried but I got an error, and I want to find a easiest way – Joe May 14 '13 at 18:39

Actually what you need is a MultiSystem. It uses similar option as GRUB and you can mount almost any ISO file. Worked well for me.

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