What shell are you using? Please try using bash if you aren't already. Ubuntu's default shell does not work well with our installation scripts.
Technical Consulting Engineer
Intel® Cluster Tools
I just asked a few colleagues to install latest MPI library on Ubuntu 12.04 (64bit) PCs. The same problem all the time!!! So there is really something wrong with the install script. Please, let me know how to install MPI Lib on Ubuntu 12.04, which is definitely supported OS.