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I have Ubuntu 14.04 Trusty installed on a MAC PPC working perfect.

This is the reason why you can't install ROS using the debian packages: there are no binary builds available for ROS on the PowerPC architecture (and I doubt there ever will be). Only x86, x64 and ARM-hf are currently built by the buildfarm, and for those architectures you can use the installation instructions on the wiki.

I can't actually find any explicit documentation on this (rep-3 fi doesn't mention any architectures), so it might be worthwhile to raise this issue on the ros/rep issue tracker and / or send a mail to ros-users about this.

I'm not at all certain it could work, but you could try to see whether a from source install works. Seeing as not many packages have been run or tested on PPC recently, I would expect at least some difficulty getting things to work.

I have Ubuntu 14.04 Trusty installed on a MAC PPC working perfect.

This is the reason why you can't install ROS using the debian packages: there are no binary builds available for ROS on the PowerPC architecture (and I doubt there ever will be). Only x86, x64 and ARM-hf are currently built by the buildfarm, and for those architectures you can use the installation instructions on the wiki.

I can't actually find any explicit documentation on this (rep-3 fi doesn't mention any architectures), so it might be worthwhile to raise this issue on the ros/rep issue tracker and / or send a mail to ros-users about this.

I'm not at all certain whether it could would work, but you could try to see whether a from source install works. Seeing as not many packages have been run or tested on PPC recently, I would expect at least some difficulty getting things to work.