Comment 1 for bug 247537

Specific to kubuntu; the issue here is that kdesudo-kde4 is not on the CD, so ubiquity isn't able to successfully reexec itself with root permissions under kdesudo.

That alone is probably insufficient to fix this bug, since kdesudo-kde4 doesn't ship kdesudo in /usr/bin, it ships it under /usr/lib/kde4/bin; so ubiquity still won't be able to re-exec itself without some path changes. Opening a kdesudo-kde4 task for this.