BlueBrick is written in C# based on the .NET Framework 4.0 and needs Mono to be interpreted. So First you need to install Mono 4.0. Installing just the running environnement doesn't seems to be enough, so I suggest you to install "MonoDevelop" via the Software Center.

Or if you prefer to install the mono package individually, it seems that you will need mono-core, mono-extras (those two may be combined for some distro into mono-complete) and mono-devel.

Once MonoDevelop is installed, click on the arrow on the right for the next step.