Ubuntu HPC Common setup of all HPC nodes

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Plan is to create an Ubuntu 20.04 template using below steps. Then we can clone the template to master / execution nodes and configure those nodes individually separately.

For common node (template) setup use:

1. Install Ubuntu 20.04 Desktop with most default values. Non-root user can be admin1.
2. Login with non-root user creation during OS installation (eg admin1) and disable screen lock and blanking of screen
3. Install ssh, vim and other required packages via:

   sudo su -
   apt update
   apt -y install openssh-server vim htop stress

4. Set desired root password:

   passwd

5. Enable root SSH by editing '/etc/ssh/sshd_config'

   PermitRootLogin yes

6. Restart sshd for changes to take effect:

   systemctl restart sshd

7. Install OpenPBS dependencies

   apt-get -y install gcc make libtool libhwloc-dev libx11-dev libxt-dev libedit-dev libical-dev ncurses-dev perl python-dev tcl-dev tk-dev swig libexpat-dev libssl-dev libxext-dev libxft-dev autoconf automake expat libedit2  python sendmail-bin sudo tcl tk libpq5

8. Install libhwloc for mpi /openpbs etc.

   wget http://archive.ubuntu.com/ubuntu/pool/universe/h/hwloc/libhwloc5_1.11.9-1_amd64.deb
   dpkg -i libhwloc5_1.11.9-1_amd64.deb

9. Install python 3.6 for openpbs

   add-apt-repository ppa:deadsnakes/ppa
   apt -y install python3.6 libpython3.6

10. Set python3.6 as default python

    update-alternatives --install /usr/bin/python python /usr/bin/python3.6 1
    python --version

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