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I have downloaded, Ubuntu 12.04 ISO Wubi installer ISO I believe. I have Ubuntu 11.10. I want to know how to upgrade 11.10 with this Wubi Ubuntu 12.04 ISO. Since I got Grub, I don't want to have both Linux. Is it possible I make Wubi ISO of 12.04 upgrade from 11.10 using grub way or on Ubuntu 11.10 logged in

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Can`t you run the upgrade online? – Mitch May 28 '12 at 16:18
I needed the Wubi for future as well, Actually , I upgraded from Maverick version. So I need this 12.04 version on USB as well. – Rohit May 28 '12 at 16:24
up vote 0 down vote accepted

we can use Zsync. The above link provides an opportunity to zsync the existing iso with the required ISOProvides the working images

This provides the details of Zsync

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