Beginning ubuntu is for most mac users now a matter of working out
which source is the right one for the live cd (which runs without
installation and lets the user get a feel for the os before they make
a decision to install on the hdd).  The live cd has the partitioning
tools included in the installation process and is very useful if you
want to dual boot with OS X, and the latest version (7.04 "feisty")
has them graphically presented to help those with command-line phobia.
The whole process is very straightforward for most installs.

Unfortunately, the managing committee at ubuntu has dropped official
support for power pc architecture as at feisty (which explains why
there are very few ppc feisties on mirror servers).
https://lists.ubuntu.com/archives/ubuntu-announce/2007-February/000098.html
So the participation of ppc users will be where documentation and
support will either live or die.  "Old world" macs can manage older
versions, but need community support even more than ppc ones.
This is the most active support forum for macs/ppcs that I know of.

http://ubuntuforums.org/forumdisplay.php?f=133

All that is just to back up my advice that you most definitely don't
rely on a single book or online guide for installation - - they are
mostly all out of date by the time you open them, even for intel
architecture.
And for mac beginner users, make sure you download a live cd image
from the ubuntu.com  ports site if you are going to begin with feisty.

http://cdimage.ubuntu.com/ports/releases/feisty/release/

The official documentation is as good as any guide I've seen, and the
ubuntu desktop environment is too easy to use even without a guide.

https://help.ubuntu.com/

Welcome, human.

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