ERPNext + Python 3

@achillesrasquinha

Are we not kill UBUNTU 14.04-32bit if we care to install Python 3.6?

"Python 3 is already installed on all currently supported Ubuntu releases. On Ubuntu 14.04, you have Python 3.4. You should normally avoid installing your own Python versions, because the system heavily depends on those which are preinstalled. "

It is not the time to upgrade VM virtual image to UBUNTU 16.04 64bit from UBUNTU 14.04 32bit?

Github issue:

https://github.com/frappe/erpnext/issues/12999