Make cell's content formula (ie "=blah blah blah"); when you get value you need copy it to clipboard, then choose paste special instead of normal paste and uncheck pasting formulas.
For setting up X server follow instructions here. (Long story short, use nvidia driver, add glx and extmod extensions to xorg.conf, and add argb-glx-visuals to monitor.)
If you created and compiled unit tests using MonoDevelop you need to copy several dlls to the same directory before you can use nunit-console with compiled dll. Those libraries can be found /usr/local/lib/monodevelop/AddIns/NUnit directory
I don't have any idea if mono-tools is still supported package, but its build is badly broken at least on FreeBSD. Anyway, the only tool I find really useful there is monodoc, which luckily can be installed manually like this: