Ok, so installing isn’t the problem, it’s that first reboot that’s the killer. Having looked thru the Ubuntu forums for advice on how to pull this off, I seem to have come away with the impression that the boot loader should not be installed onto the MBR, but rather the linux partition itself (dev/sda3 in my case). When I tried that and rebooted, all I got for my efforts was a quick flash of something about GRUB, and then another reboot to the rEfit screen. Rinse, recycle, repeat…
After repeating the installation a few times with the same result, I installed GRUB to the MBR (the way one would normally do it on PC hardware), and it worked. The rEFit boot menu came up with the mandriva option alongside of OS X, and I was giddy with anticipation.
My hopes were soon crushed as KDE wouldn’t start. Hmm, maybe that error message during installation about libkdebase4 being corrupt wasn’t kidding… Oh well, icewm started up ok and I was able to get libkdebase4 from the repositories, and then KDE was fine. Obviously I burned a bad CD.
Wireless worked right away.
Next thing to figure out is this infernal trackpad. It’s just way too sensitive; it interprets regular mouse motions as clicks when I definitely did not click.