Downloaded a daily of 17.04 PPC alpha recently and a couple days ago found the time to boot it up and give it a test run. Initially there were a bunch of I/O errors while booting up, which went on for awhile until we finally got to cursor and GUI session--so that part was fine and didn't require any boot params to get done.
But, the "Welcome" screen appeared, however it was devoid of data; Software Boutique was the same. I believe that both of these apps produced a crash report window, can't be sure since the crash window opened a bit after launching the session--the first one said, "Executable path-- /usr/lib/powerpc-linux-gnu/webkit2gtk-4.0/WebKitWebProcess" . . . with a further error when I tried to upload the crash report that it generated . . . "cannot connect to crash database-plz check internet connection." I opened a Terminal and ran "ping google.com" and it showed connection was fine. Possibly something with apport that is not working?
No Firefox or any web browser seemed included?
There was, as mentioned, another crash as I tried to restart out of the session, possibly from the Software Boutique app that opened to an empty window--since it was logging out I didn't see if the report said anything different than the first one.
"Restart" goes to a blinking cursor on black background . . . "failed deactivating swap" . . . and then didn't restart after the disk was ejected--had to hit the power button to shut down.
That's the report from PPC-land for 17.04 U-MATE, some things like basic GUI were fine out of the box, but, still very "Alpha" in nature.