This is a popular question, I tried this suggestion Can i update from "ubuntu-12.04-desktop-i386.iso" file? , but problem is gksu "sh /media/cdrom/cdromupgrade" asks for a password, and even if I enter the correct password it says wrong. and BTW, I don't see any cdromupgrade file file in my ubuntu-13.10-desktop-amd64.iso . So, what is the way to upgrade WITHOUT USING THE LIVE-USB OR CD within ubuntu from an ubuntu iso?
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See if This helps. – Mitch Oct 21 '13 at 17:34
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You may simply use the terminal commands to upgrade via internet.
sudo do-release-upgrade
For a development version, use
do-release-upgrade -d
Refer the following link.
http://help.ubuntu.com/12.04/serverguide/installing-upgrading.html
Waldir Leoncio
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Abhijith
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