[ncl-install] ncl: error while loading shared libraries: libgfortran.so.3: cannot open shared object file: No such file or directory

[Zipporah Njeri]

Hallo, I have been trying to install and run ncl and I keep getting errors. 
I am using Ubuntu 20.04.2 LTS (GNU/Linux 5.4.0-74-generic x86_64) 
I installed [ https://www.earthsystemgrid.org/api/v1/dataset/ncl.640.nodap/file/ncl_ncarg-6.4.0-CentOS6.8_64bit_nodap_gnu447.tar.gz | ncl_ncarg-6.4.0-CentOS6.8_64bit_nodap_gnu447.tar.gz ] as instructed in [ http://www.ncl.ucar.edu/Download/ | http://www.ncl.ucar.edu/Download/ ] . I then did try to run the command 

ncl util/plotgrids.ncl 

I got a response that NCL does not exist and I can install i using sudo apt install ncl_ncarg. 

When I tried to test the NCL, i got this error 

root at ksawrf:/home/ksa# which ncl 
/usr/local/ncl-6.4.0/bin/ncl 
root at ksawrf:/home/ksa# ncl -V 
ncl: error while loading shared libraries: libgfortran.so.3: cannot open shared object file: No such file or directory 
root at ksawrf:/home/ksa# sudo apt-file search libgfortran.so.3 
root at ksawrf:/home/ksa# locate libgfortran.so.3 
[ mailto:root at ksawrf:/home/ksa# | root at ksawrf:/home/ksa# ] 

I tried to install ncl 6.2.2 and I got the same error. 
I have checked the lib directories in the usr and local directory and I cannot see libgfortran.so.3 
so I tried to install it and this is the error I got 

ksa at ksawrf:~$ sudo apt-get install libgfortran3 
[sudo] password for ksa: 
Reading package lists... Done 
Building dependency tree 
Reading state information... Done 
E: Unable to locate package libgfortran3 
ksa at ksawrf:~$ 


Please help 

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