Upgrading using the alternate CD/DVD
Use this method if the system being upgraded is not connected to the Internet.
Download and burn the alternate installation CD.
Insert it into your CD-ROM drive.
A dialog will be displayed offering you the opportunity to upgrade using that CD.
Follow the on-screen instructions.
If the upgrade dialog is not displayed for any reason, you may also run the following command using Alt+F2: gksu "sh /cdrom/cdromupgrade"
Or in Kubuntu run the following command using Alt+F2: kdesu "sh /cdrom/cdromupgrade"