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Upgrade to a new release

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The easy way

sudo update-manager -d

The slightly harder way

First, put your Ubuntu in a good shape:

sudo dpkg --configure -a
sudo apt-get -f install
sudo apt-get --fix-missing install
sudo apt-get clean
sudo apt-get update
sudo apt-get upgrade
sudo apt-get dist-upgrade
sudo apt-get clean
sudo apt-get autoremove

The previous commands in one line:

sudo dpkg --configure -a && sudo apt-get -f install && sudo apt-get --fix-missing install && sudo apt-get clean && sudo apt-get update && sudo apt-get upgrade && sudo apt-get dist-upgrade && sudo apt-get clean && sudo apt-get autoremove

Then make a copy of /etc/apt/sources.list and modify the old distribution name to the new one everywhere. Example:

sudo sed -i "s/intrepid/jaunty/g" /etc/apt/sources.list

Upgrade your system:

sudo apt-get clean
sudo aptitude update
sudo aptitude dist-upgrade
sudo apt-get -f install
sudo apt-get clean

The previous commands in one line:

sudo apt-get clean && sudo aptitude update && sudo aptitude dist-upgrade && sudo apt-get -f install&& sudo apt-get clean

Finally, check your new Ubuntu version:

lsb_release -a

This tip was found at https://answers.launchpad.net/ubuntu/+question/51463 .