Installation on existing raspbian

Installation from source

see the five steps described in the "Installing from source" section of

https://octoprint.org/download/

Installing Python2.7 including pip and virtual env

python --version
Python 2.7.13

pip install virtualenv

Collecting virtualenv
  Downloading https://files.pythonhosted.org/packages/7e/1b/6c00d57127608793e16e8b7f813e64d58a1938505c42fe190d1386ab41e1/virtualenv-16.4.0-py2.py3-none-any.whl (2.0MB)
    100% |████████████████████████████████| 2.0MB 134kB/s 
Installing collected packages: virtualenv
Successfully installed virtualenv-16.4.0

virtualenv will not be available via command line at this point so the instructions from the forum article will provide virtualenv.

sudo apt install python-pip python-dev python-setuptools python-virtualenv git libyaml-dev build-essential

Obtaining the octoprint source

git clone https://github.com/foosel/OctoPrint.git

Creating a virtual environment

wf@pito:~/source/python/OctoPrint $ virtualenv venv
Running virtualenv with interpreter /usr/bin/python2
New python executable in /home/wf/source/python/OctoPrint/venv/bin/python2
Also creating executable in /home/wf/source/python/OctoPrint/venv/bin/python
Installing setuptools, pkg_resources, pip, wheel...done.

Installing OctoPrint into that virtual environment

wf@pito:~/source/python/OctoPrint $ ./venv/bin/python setup.py install
running install
running bdist_egg
running egg_info
creating src/OctoPrint.egg-info
...
Adding pytz 2018.9 to easy-install.pth file

Installed /home/wf/source/python/OctoPrint/venv/lib/python2.7/site-packages/pytz-2018.9-py2.7.egg
Finished processing dependencies for OctoPrint==1.3.10

= Start OctoPrint

./venv/bin/octoprint serve

OctoPrint

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