The --setuuid option is only available for VirtualBox 4.1+. However, all versions support the sethduuid command.
Unrar seems to only play nice when certain files are in very specific locations. Unfortunately these locations are owned by root. A fix could be put together using sudo, but it makes more sense to install from apt if sudo has to be used anyway. For now the README notes the unrar requirement for Linux platforms.
Add doc on how to recover from a failed installation
Signed-off-by: Craig S. Cottingham <email@example.com>
Added a password hint to the README.