OK so it's a fairly long time since anyone has said anything thing about this 
problem. I found a resolution after reading about the symtoms online. I have a 
G5 dual without the issues and a Emac G4 single without the issues. However my 
G4 1.5 macmini would constantly freeze up. So the "fix" is to enter at 
install... live video=offb:off video=radeonfb:off radeon.modeset=1 
radeon.agp.mode=-1
after install and reboot at yaboot screen enter... Linux video=offb:off 
video=radeon.modeset=1 radeon.agpmode=-1

This works on the G4 mini but requires the (after install) line
everytime you reboot the computer.Not so much a fix but rather a control
measure and a little bit of a hassle but it does work. I havn't tried it
on my dual G4's or any other mac than the emac G4 but i suspect any card
based mac doed not need it just the ones with  the graphics on the
motherboard (radeon) BTW i want to thank all peoples who work hard to
bring us users the various Linux's for the powermacs. Up until recently
you have kept these machines alive and worthwhile.

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https://bugs.launchpad.net/bugs/1571416

Title:
  System freezes shortly after reaching the desktop (Ubuntu MATE 16.04,
  PowerPC)

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