Ok, so now the setup fails while getting the erpnext app, so after installing wkhtmtopdf it passed on, apparently, this --become-user=user appears to be kind of generic, being the exit point of a successful install so any errors that terminate the script also push this error.
So it appears that the main issue may be some ISP level connectivity problem, ie its a timeout, if you look at the attachments, the remote end hung up, rpc calls fail, so this may be a timeout issue; with this, this may not be a general problem, but to improve the experience; I will suggest strongly that these lines be added to the install process:
sudo apt-get install xvfb libfontconfig wkhtmltopdf
regarding the wkhtmltopdf error which is a very frequent occurrence during installs.
I will go ahead and give this another run… with a different internet connection