lxdream
lxdream is a Linux-compatible emulator that allows to run games from the Sega Dreamcast.
To run lx dream you will need the following: Ubuntu:To install lxdream on Ubuntu you can use the pre-compiled .deb file which is available here: http://www.lxdream.org/download.php .
You will likely get two error messages related to the BIOS. Due to legal reasons I can't link to a BIOS for you but it's easy enough to find. Once you have a BIOS load up lxdream click the "paths" tab in the "settings" menu and specify the location of the "dc_bios.bin" and "dc_flash.bin".
Below is a rough guide of how I installed this on Ubuntu 14.04 LTS. The emulator is semi-functional, and therefore is not included by default in RetroRig. This relies on a library that have now transitioned to libaudiofile I believe, so a symlink must be made. The package must be installed ignoring the dependencies. If not, you must unpack and change the depends lines yourself. This may change in the future if this emulator is deemed acceptable.
sudo apt-get install -y libesd0-dev libaudiofile-dbg
sudo dpkg -i --ignore-depends=libaduiofile0 <FILE>
cd /usr/lib/x86_64-linux-gnu/
sudo ln -s libaudiofile.so libaudiofile.so.0
With being the .deb package name.