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[ubuntu] Upgrade from 10.10 to higher version

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http://ubuntuforums.org – Hello I am using ubuntu 10.10 currently and I was trying to upgrade to higher version but the update manager is not showing option for that. I also tried it using the terminal (sudo apt-get upgrade) and it is not working. Also earlier I was having problem with some PPA to update the system before upgrading it. It was related to the following PPA and I unchecked it from the Software Sources http://ppa.launchpad.net/mozillateam...-stable/ubuntu But now there is no option of upgrading and from terminal also it is not working. Please help me in upgrading to higher versions. Thank you (Hardware)