I succeed to make a bootable install image from Ubuntu 10.10 Powerpc Alternate install cd, just using command described in this post :
http://www.powerdeveloper.org/forums/vi ... php?t=1509
Now, I can start installation from cd, select all requested options and run the install on my partition. But the install process fails (i.e. stops) after 83%, just at the step installing 'linux-powerpc_220.127.116.11.16_powerpc.deb':
in-target: update-initramfs: Generating /boot/initrd.img-2.6.35-22-powerpc
in-target: Warning: cannot read table of mounted file systems
in-target: : No such file or directory
In another console (alt+F2), I can run 'df' command without any problem. In drawer /target/boot, there is a 'initrd.img-2.6.35-22-powerpc.new' file but with 0 as size.