Ubuntu provides serveral methods to upgrade your Ubuntu desktop or Ubuntu server from command-line interface best and recommended as follows

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Method 1:
#sudo apt-get install update-manager-core
#sudo do-release-upgrade

Method 2:
#sudo apt-get install update-manager
#sudo update-manager -d

Method 3:
#sudo apt-get update
#sudo apt-get upgrade
#sudo apt-get dist-upgrade
#sudo reboot

Awesome you have successfully upgraded Ubuntu 11.04 (Natty Narwhal) to Ubuntu 11.10 (Oneiric Ocelot)

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