MATE 16.04 on iBook G4 GUI freezes - does not work

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When I dug out the iBook G4 last month, I was informed of some commands to enter at the yaboot prompt, which may be of use to you:

Booting from DVD:

live radeon.agpmode=-1 radeon.modeset=1 video=offb:off video=radeonfb:off

Booting once installed:

Then after install add:

radeon.agpmode=-1 radeon.modeset=1 video=offb:off video=radeonfb:off`

to the "apped" in /etc/yaboot.conf and then run ybin -y to update the boot loader.

I originally had Lubuntu 12.04 running on it. I didn't have a DVD-R to write to, nor could I get it to boot via USB, so I had to upgrade it 12.04 → 14.04 → 16.04 and then switch LXDE for Ubuntu MATE... especially considering the partition is tiny!

I don't recall it freezing, but the graphics performance wasn't very good.