What is the problem?
I try to install OctoPrint on Ubuntu 18.04 (with Python 3.6.9) installed inside of an virtual environment.
What did you already try to solve it?
I've tested the role usage on the Ubuntu 18.04 - I use Vagrant and [the generic/ubuntu1804 box](https://app.vagrantup.com/generic/boxes/ubuntu1804) - and it fails.
Even if the virtual environment is active
(venv) root@octoprint1804:/home/pi/Octoprint# which python
/home/pi/Octoprint/venv/bin/python
(venv) root@octoprint1804:/home/pi/Octoprint# python --version
Python 3.6.9
(venv) root@octoprint1804:/home/pi/Octoprint# pip3 --version
pip 21.3.1 from /home/pi/Octoprint/venv/lib/python3.6/site-packages/pip (python 3.6)
(venv) root@octoprint1804:/home/pi/Octoprint# which pip3
/home/pi/Octoprint/venv/bin/pip3
(venv) root@octoprint1804:/home/pi/Octoprint# pip3 install octoprint==1.8.1
ERROR: Could not find a version that satisfies the requirement octoprint==1.8.1 (from versions: 1.4.0rc1, 1.4.0rc2, 1.4.0rc3, 1.4.0rc5, 1.4.0rc6, 1.4.0, 1.4.1rc1, 1.4.1rc2, 1.4.1rc3, 1.4.1rc4, 1.4.1, 1.4.2, 1.5.0rc1, 1.5.0rc2, 1.5.0rc3, 1.5.0, 1.5.1, 1.5.2, 1.5.3, 1.6.0rc1, 1.6.0rc2, 1.6.0rc3, 1.6.0, 1.6.1, 1.7.0rc1, 1.7.0rc2, 1.7.0rc3, 1.7.0, 1.7.1, 1.7.2, 1.7.3)
ERROR: No matching distribution found for octoprint==1.8.1
(venv) root@octoprint1804:/home/pi/Octoprint# /home/pi/Octoprint/venv/bin/python3.6 -m pip install octoprint==1.8.0
ERROR: Could not find a version that satisfies the requirement octoprint==1.8.0 (from versions: 1.4.0rc1, 1.4.0rc2, 1.4.0rc3, 1.4.0rc5, 1.4.0rc6, 1.4.0, 1.4.1rc1, 1.4.1rc2, 1.4.1rc3, 1.4.1rc4, 1.4.1, 1.4.2, 1.5.0rc1, 1.5.0rc2, 1.5.0rc3, 1.5.0, 1.5.1, 1.5.2, 1.5.3, 1.6.0rc1, 1.6.0rc2, 1.6.0rc3, 1.6.0, 1.6.1, 1.7.0rc1, 1.7.0rc2, 1.7.0rc3, 1.7.0, 1.7.1, 1.7.2, 1.7.3)
ERROR: No matching distribution found for octoprint==1.8.0
### Have you tried running in safe mode?
WRITE HERE
### Did running in safe mode solve the problem?
Not applicable
### Systeminfo Bundle
Not applicable
### Additional information about your setup
[The generic/ubuntu1804 box](https://app.vagrantup.com/generic/boxes/ubuntu1804) Vagrant box.
My tests are in a context of updates to the Ansible role https://github.com/semuconsulting/ansible_octoprint/.