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I have Ubuntu 12.04 installed on my system. I want to upgrade it to Ubuntu 13.04. I want to do this upgrade using an .ISO image of Ubuntu 13.04 and without a USB drive.

I tried How to upgrade Ubuntu from an ISO image .

But it didn't work for me.

After running the proposed commands, I didn't have any alerts about updating. I also don't understand the gksu part of the solution.

Also, is this possible to do by using a networked computer? By this I mean the .ISO file is on another computer.

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did you try burning the iso onto a disk then loading it into your dvd drive and installing it from their, after booting from dvd drive once the iso is burned onto disc? –  Afargo May 3 '13 at 17:17
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2 Answers

Just make a bootable USB or CD/DVD and boot it up as you would install ubuntu. When you are asked what you want to do just select "Upgrade...": Option

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In the question I have mentioned that I don't want to use usb or cd fro this purpose. –  user155249 May 4 '13 at 15:48
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You can boot ISO files from Grub. However, I think you will need to have the ISO file on another medium (such as another hard drive, or a USB/CD/DVD)

Booting from Grub2: https://help.ubuntu.com/community/Grub2/ISOBoot

Installing over the network: Is it possible to install Ubuntu through network?

And finally: https://help.ubuntu.com/community/Installation#Installation_without_a_CD

Though if you have your /home in a separate partition (or any other non-standard filesystem configurations like that), this will not work.... You must reinstall, rather than upgrade.

Though you can simple upgrade incrementally through the normal method:

http://www.ubuntu.com/download/desktop/upgrade though you may have to check your settings.

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