How to upgrade Ubuntu Gutsy 7.10 to Hardy 8.04

OK, now that the latest Ubuntu Linux has been released, a lot of people want to try and test the system, myself included.  Of course, the first option is to download the live CD and test it myself, which I did. After knowing that all the devices in my computer are supported well (at least, most of the devices that I am using), then I want to upgrade my existing Gutsy installation to Hardy. However, there is a catch…

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