Comment 5 for bug 1090977

Had the same problem. Suspicious, I then completely purged mono and monodevelop from my system and did:

   apt-get install mono-complete monodevelop monodevelop-nunit monodevelop-debugger-gdb

But, still, when trying to run any program from within monodevelop I get "cannot execute" because "filename has not been set".

I then do `apt-get install xterm`, close monodevelop, re-open, and now it works.

Other sources to confirm this:

   http://www.programmersranch.com/2013/05/c-programming-on-linux-with-monodevelop.html
   http://stackoverflow.com/a/22060671/841830
   http://unix.stackexchange.com/a/126051/52393 (but I didn't need to do the extra steps there, just installing xterm was enough)