BTW, I could get rid of the error and proceed to installation by restricting the list of repositories to the Canonical ones only (i.e. disabling the extra Canonical-partners one) in software-properties-gtk.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1571341 Title: upgrade from 15.10 to 16.04 failed on a PowerBook G4, ppc To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1571341/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs