I think Powerbook Pismo uses a powerpc processor, not intel-compatible. It is an excellent processor, especially for notebooks, thanks to its low power consumption. But it is a RISK processor and uses an instruction set other than that of the x-86 type (intel - AMD) processors. That's why you can't run any system or software designed and compiled for x-86 processors.
There are Linux distros for powerpc processors (slackware, debian, gentoo and many others). About Ubuntu, I found that there are versions 6.10 edgy and older for ppc. You can search for further info about Linux distros that support powerpc in a special website:
http://distrowatch.com/
linuxquestions.org is a big Linux support forum:
http://www.linuxquestions.org/
http://sourceforge.net/projects/ppclinux
If this Powerbook works, I would like to keep it running in the original configuration, as a collection piece The Apple community is very supportive, I think.
You can't use the livecd to boot directly Pismo, because livecd is compiled for x86 processor. In this case you have to compile it from source, unless it is already compiled in any powerpc distro s/w collection.
*** It is highly recommended to backup any important files before doing resize/move operations. ***