[ncl-install] The third test for NCL does not produce a PNG file

[Zipporah Njeri]

Hallo NCL users, 
I am trying to install NCL from a precompiled binary in ubuntu 20.04. 
While testing NCL using the commands below, 

ncl -V
  ncl $NCARG_ROOT/lib/ncarg/nclex/gsun/gsun02n.ncl
  ncl $NCARG_ROOT/lib/ncarg/nclex/nug/NUG_multi_timeseries.ncl 

The first two tests were successful but the 3rd step did not produce a PNG file. 

ksa at ksawrf:~$ ncl $NCARG_ROOT/lib/ncarg/nclex/nug/NUG_multi_timeseries.ncl
 Copyright (C) 1995-2017 - All Rights Reserved
 University Corporation for Atmospheric Research
 NCAR Command Language Version 6.4.0
 The use of this software is governed by a License Agreement.
 See http://www.ncl.ucar.edu/ for more details. 

I ran the following command to check if the .png file exists and it shows that it exists. 

ksa at ksawrf:~$ ls -l NUG_multi_timeseries.png
-rw-rw-r-- 1 ksa ksa 174994 Jun 16 08:39 NUG_multi_timeseries.png 

What could be the problem? 
Please help... 


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