There are some information about a new Medusa cad version. The installation information for common linux distros are available but how does Medusa installation with the Debian Wheezy 64 bit goes? This tried couple times with the 32libs e.g. ia32. The latest problem code is: "No protocol specified csginst: cannot connect to X server :0".
This has come up before, and I think it was something to do with the terminal applications available. The Medusa script has a list: GUESS_XTERMS="xterm rxvt dtterm eterm Eterm kvt konsole aterm" can you check that you one of those installed?