押すなよ！絶対押すなよ！

sudo apt-get update
sudo apt-get upgrade
sudo mv /etc/apt/sources.list{,.old}
sudo sed -e "s/jaunty/karmic/g" /etc/apt/sources.list.old > sources.list
sudo mv sources.list /etc/apt/
sudo apt-get update
sudo apt-get dist-upgrade <- いまここ