difference in running fortran program via vmware and directly ubuntu

hi,
i wanted to run FORTRAN code in Ubuntu . I am able to run it successfully in ubuntu that is installed via vmware by using make command and directly executing .exe file through it.
But the same thing when i tried in ubuntu(directly installed) does not work,in fact even after giving the .exe file by make file it is not running in the terminal.
Also if i tried to run it by "gfortran main.f" (directly installed Ubuntu) it is showing errors..
"undefined reference to ....." here .... are the corresponding calling functions/files.
Please help me out from this
Thank you

A bump for the move.

try reinstalling gfortran

Code:

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sudo apt-get install gfortran

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