Let us know how it goes. The rage128 cards are known to be finicky with Linux.
It was a hell of a job but as I was thinking yesterday, I managed to force the start up of X/lightDM

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If you have an iMac G3 (slot loading version) follow this procedure just for the installation via live CD.
Boot the live CD/USB in recovery mode with yaboot parameters:
Code:
live video=aty128fb:1024x768-16 single
wait for the system to start up
look at both terminal 1 and 7 (CTRL+ALT+F1, CTRL+ALT+F7) to check where it places the terminal with root access
create the configuration files for Xorg, copy it in the X11 startup folder, and edit the file using following commands:
Code:
X -configure
cp /root/xorg.conf.new /etc/X11/xorg.conf
nano /etx/X11/xorg.conf
then for the iMac G3 CRT screen you need to add the following lines in the Monitor section:
Code:
HorizSync 58-62
VertRefresh 75-117
then, for avoiding the hang up with the ATI Rage 128 I just modified the driver in the Device section:
save and exit. Type in the terminal:
Screen goes black for a while, while loading from the slow USB 1 bus.
Finally the system start and you install Lubuntu Remix 12.04 on an iMac G3.
When you reboot you may still need to help with "Linux video=ofonly" yaboot code and "start lightdm" from terminal.
This was just the basics to install it using generic graphics drivers. Of course system shows graphic glitches and some apps are unstable. What I will try today is to make it work with the "r128" drivers to get at least GLX to work

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Cheers
Francesco