Review the day one post. However this time don’t modify the dns server configuration files.
And from the day 2 post don’t disable DVR in neutron.
Once I made these changes the installation proceeded without a hitch. Even on a laptop with only 32GB of Ram!!!
l didn’t have the time to investigate which of these was the root cause of the failure changing both at once. If I was a gambling man, which l’m not, my money would be on the DVR setting.