Installing ERPNExt manually following tutorial : error at step 5

Good day all

Following the install instructions below to install ERPNext on Ubuntu:

https://www.digitalocean.com/community/tutorials/how-to-install-an-erpnext-stack-on-ubuntu-18-04

I have used this tutorial before ( 1 year ago) and I cannot recall that I bumped my head on this error.

I created a fresh droplet (4vcpu 8G )

Followed steps 1-4 … all went well

At step 5 when entering this command: sudo -H python3 -m pip install --upgrade setuptools cryptography psutil

I get the error:

################################################################# Complete output from command python setup.py egg_info: Traceback (most recent call last): File “<string>”, line 1, in <module> File “/tmp/pip-build-ce8tbk4d/cryptography/setup.py”, line 14, in <module> from setuptools_rust import RustExtension ModuleNotFoundError: No module named ‘setuptools_rust’

        =============================DEBUG ASSISTANCE==========================
        If you are seeing an error here please try the following to
        successfully install cryptography:

        Upgrade to the latest pip and try again. This will fix errors for most
        users. See: https://pip.pypa.io/en/stable/installing/#upgrading-pip
        =============================DEBUG ASSISTANCE==========================

########################################################################

I went to the suggestged website which offered 2 possible ways of solving the problem but the first also failed.

Can someone perhaps offer some assistance

Many thanks John