Hello,
I was able to install OP on Ubuntu 14.04 Digital Ocean. Everything went of except that there is not design or css.

When I type

RAILS_ENV="production" bundle exec rake assets:precompile

I get this error

require 'rails/all'... 0.970s
Bundler.require... 3.650s
$(npm bin)/webpack --config webpack.config.js
sh: 1: /home/sw092d/public_html/frontend/node_modules/.bin/webpack: not found
rake aborted!
Command failed with status (127): [$(npm bin)/webpack --config webpack.config...]
/home/sw092d/public_html/lib/tasks/assets.rake:48:in `block (3 levels) in <top (required)>'
/home/sw092d/public_html/lib/tasks/assets.rake:47:in `chdir'
/home/sw092d/public_html/lib/tasks/assets.rake:47:in `block (2 levels) in <top (required)>'
Tasks: TOP => assets:precompile => assets:compile_environment => assets:webpack
(See full trace by running task with --trace)

and when I do

find  -name 'webpack'
./frontend/node_modules/webpack

Can you please help me?

Thx