I couldn't execute a fortran compiled code in ubuntu 11.10 32 bit.

Error message is

bash: ./filename : Cannot execute binary file.

I've also installed the gcc and gfortran libraries

Is there any way to help?

$ file um
um: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), dynamically linked (uses shared libs), for GNU/Linux 2.6.9, not stripped
Best Answer

As you can see from the output of file um that you posted in a comment, your binary is a 64-bit binary.

32 bit systems cannot run 64 bit binaries, it only works the other way around.