Trying to install certbot on CentOS

Following the advice obtained here, I am trying to get a LetsEncrypt certificate.

These are the instructions:

Step 1: https://snapcraft.io/docs/installing-snapd

Step 2: https://certbot.eff.org/lets-encrypt/centosrhel7-apache

My problem is this error message:

# snap install --classic certbot

error: system does not fully support snapd: cannot mount squashfs image using "squashfs": mount: /tmp/sanity-squashfs-881328484: failed to setup loop device: No such file or directory

Apparently, RedHat/CentOS are not supporters of snap.

TIA

OS: CentOS 7