Ubuntu and Xubuntu has gotten too big for just one CD. I prefer to use CD not DVD. Many older machine do not have DVD capability or not USB bootable. So how can I get Ubuntu on several CDs. Is there some way to do this??? Will Ubuntu make a both CD and DVD iso options??
Yes, there is an alternative: the official Ubuntu Minimal CD, that weights only 30mb https://help.ubuntu.com/community/Installation/MinimalCD#A32-bit_PC_.28x86.29
This particular officially supported image is really small, and will download the data required to perform the installation (instead of having it within the CD). The ISO is really light weights at most 30Mb (~25Mb for standard machines) so you won't have the size problem to burn it in a CD. Of course, the counter is that you must be connected to internet in order to perform the install. Also notice that for Ubuntu's older than 13.04 this .iso can only be burned in a CD, and won't boot from an USB stick.
Last, this is a "flavor" of the alternate install, that means no graphical interphase (no fancy windows taking you smoothly through the install process). It is an old-school (windows xp like) installer. If you have doubts on how to proceed witht his install, I recommend you to run in another machine a full-featured live ISO since the steps and the sequence are very similar, and seeing the dialogs and such in parallel may help you for the first time. Good luck!