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I have downloaded the compressed preinstalled image from

The file downloaded was ubuntu-12.04-preinstalled-desktop-armhf+omap.img.gz

Its a compressed gz file and I wanted to know is it straightaway bootable like any other ubuntu iso in Virtual Box. My host system is Windows Server 2008.

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Sorry, Virtualbox does not support hardware emulation of the ARM architecture. You may want to look at qemu instead, which does support software emulation (slow, but works).

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Tried qemu for windows but it does not take the img file mentioned in question as valid bootable source. When I extract its a .raw file of 1.8 gb – Arko D Jul 28 '12 at 17:24

You can try using qemu, it supports arm emulation. Therefore you'll need the additional package qemu-kvm-extras.

I suggest removing virtualbox because kvm uses the same features on your native cpu for virtualization.

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