从cdrom升级ubuntu 6.06 -> 7.04

修改源
deb cdrom:[Ubuntu 7.04 _Feisty Fawn_ - Beta i386 (20070322.1)]/ feisty main restricted

挂镜像
sudo mount -t iso9660 -o loop XXX.iso /media.cdrom

sudo apt-cdrom -m -d /cdrom add

sudo apt-get update

sudo apt-get dist-upgrade