Error during pip installation

[T2L]

Vagrant assumes that this means the command failed!
curl https://bootstrap.pypa.io/get-pip.py | sudo python
Stdout from the command:
Stderr from the command:
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100 1883k  100 1883k    0     0  3021k      0 --:--:-- --:--:-- --:--:-- 3022k
Traceback (most recent call last):
  File "<stdin>", line 24226, in <module>
  File "<stdin>", line 199, in main
  File "<stdin>", line 82, in bootstrap
  File "/tmp/tmp9wtDar/pip.zip/pip/_internal/cli/main.py", line 60
    sys.stderr.write(f"ERROR: {exc}")```

[T2L]

So, PiP version 21+ requires Python 3.6+, which is not installed on Ubuntu 16.04 by default

[T2L]

After digging into the issue here are the options:

A. Force PiP to use Python 3.5 by overriding pip_install_cmd for Ansible Local provisioner (see https://www.vagrantup.com/docs/provisioning/ansible_local#pip) - curl https://bootstrap.pypa.io/3.5/get-pip.py | sudo python

Drawbacks:

• Python 3.5 is not supported anymore
• it might not work for newer Ubuntu versions
• this will lock the project with PiP 20.x.x

B. Install the latest (Python 3.9) on the machine and make it default

Drawbacks:

• Python 3.9 does not include diskutils

  Debian has decided that diskutils is not a core python package, so it is not included in the last versions of Debian and Debian-based OSes.

• python3-diskutils package is not available for Ubuntu 16.04

C. Install the still supported Python 3.7 on the machine and make it default
D. Let's migrate to Ubuntu 18.04 as the default (or maybe 20.04) #235