Another gotcha would be that it would be difficult to rescue since the ubuntu livecd doesn't have that app by default and I don't know of any livecds that do
If the live disc doesn't have that "app", then how can it possibly set up home directory encryption during the installation process?
I saw that they used apt to install it, so I would imagine that it doesn't have it installed by default. Also not all livecds would have it so you would have to depend on the ubuntu livecd