Ubiquity installer package workaround
http://permalink.gmane.org/gmane.linux.ubuntu.devel.utah/24
I did some research on installing proprietary drivers and came across
ubiquity/use_nonfree and ubiquity/nonfree_package. It's a bit of a hack,
because it wasn't intended for this kind of functionality, but it looks like
you could set ubiquity/use_nonfree to true, and it will install the packages
defined in ubiquity/nonfree_package. This by default is a metapackage called
ubuntu-restricted-addons, but you could add the packages you need here. It
would look cleaner than using success_command.