Comment 1 for bug 1229409

System updates are applied from the recovery environment and certainly does call sync at that point.

As for the rest of the system, I don't think we should try to hack around this. Our standard shutdown sequence is supposed to be clever enough to unmount everything and call sync before rebooting. If we somehow bypass that on touch, that's the problem, if we don't, then we have a larger bug which affects Ubuntu at large and should be fixed.

In any case, I'd be opposed to doing any change to lxc-android-config for that specific problem (since it's the wrong place).