GEMPAK Installation Problems

I've finished installing GEMPAK, however, when I type a command into the
prompt I get:

%sflist: error while loading shared libraries: libg2c.so.0: cannot open
shared object file: No such file or directory.

Can anyone tell me where I went wrong? Is it a problem with GEMPAK? or
am I missing something in Linux (Ubuntu).  I am new too both Linux and
GEMPAK.

Regards
Chris