Dear Karl,
I apologize for mistakenly having sent the message to you/ferret users. Actually I have installed the PyFerret 1.1.0 in my Ubuntu 14.04 64-bit system with pyferret_executables-1.1.0-Ubuntu-14.04-64 and when I run the script its shows following error.
nandu@nandu:~$ pyferret -nojnl
NOAA/PMEL TMAP
FERRET v6.93 (PyFerret 1.1.0)
Linux 3.13.0-39-generic - 11/13/14
23-Nov-15 10:10
yes? go low_pressure.jnl
can data/all; can var/all; set mem/size=300
Cached data cleared from memory
file/var="lat,lon"/type=numeric low_press.txt
go basemap x=70:100 y=0:25
setfont: Read error on font file:/usr/local/ferret/ppl/fonts/fnt01.chr