[ncl-install] Messy installation through apt in Ubuntu 20.04 and the fix for it.

[Muhammad Yunus Ahmad Mazuki]

Hello,

I would like to share that if you use 'apt install ncl-ncarg' in
Ubuntu 20.04, the ncl installation will be messy.

The ncl components will be installed in various places, that is:
/usr/bin
/usr/lib/ncarg
/usr/include/ncarg
/usr/share/ncarg

Even more messy is that there is a folder inside /usr/share/ncarg/ and
/usr/lib/ncarg that will just point at each other and create an
endless loop.

The fix to this messy problem and making sure that the ncl
installation will work

For the traditional lib directory and sub directories.
sudo mkdir /usr/local/ncl
sudo mkdir /usr/local/ncl/lib
sudo ln -sf /lib/x86_64-linux-gnu/ncarg/* /usr/local/ncl/lib/.
sudo mkdir /usr/local/ncl/lib/ncarg
sudo ln -sf /usr/share/ncarg/* /usr/local/ncl/lib/ncarg/.

For the traditional include directory and sub directories.

sudo mkdir /usr/local/ncl/include
sudo mkdir /usr/local/ncl/include/ncarg
sudo ln -sf /usr/include/ncarg* /usr/local/ncl/include/ncarg/.


Optional, remove the link loop
sudo rm /usr/share/ncarg/ncarg

I think there's no need to link the bin directory

Then add in ~./bashrc
export NCARG_ROOT=/usr/local/ncl

This is important as the ncl binaries still depends on libgfortran3
which is no longer included in Ubuntu 20.04. Therefore the
instructions in the pages below will not work in Ubuntu 20.04, and
possibly all future versions of Ubuntu.

https://www.ncl.ucar.edu/Download/install_from_binary.shtml

https://www.ncl.ucar.edu/Download/windows_linux_subsystem.shtml

Yunus.