Comment 2 for bug 1233281

hmm, that leaves us with a bit of a catch22, ureadahead expects /var/lib/ureadahead/debugfs to be available ... by making /var/lib/ureadahead writable, the formerly mounted /var/lib/ureadahead/debugfs gets hidden by the rw mount ...

i can work around this by adding a pre-start script to the ureadahead upstart job that mounts /var/lib/ureadahead/debugfs before firing up ureadahead, but i wonder if there is a way to have system-image do the right thing instead