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The 'ppc' architecture is no longer a supported architecture. This was announced long ago, ie. https://lists.ubuntu.com/archives/ubuntu-devel- announce/2016-December/001199.html Because of this, I've changed the bug status to 'Invalid' as you are not on a supported architecture for the intended upgrade process. If you believe I'm in error, please leave a comment explaining why and the status can be returned to "New". ** Changed in: ubuntu-release-upgrader (Ubuntu) Status: New => Invalid -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1931499 Title: cannot upgrade from 16 to 18 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1931499/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs