I was wondering " Is it possible to install and run Ruby, Ruby On Rails on Windows 10 (Linux subsystem) Ubuntu Bash " and a short answer is YES!
I even managed to install Ubuntu Desktop apps on it.
So, basically, you run Bash on Ubuntu on Windows as root and do regular installation steps for installing Rbenv, Ruby, Ruby On Rails.
1 - Step Install Rbenv and Ruby and Ruby On Rails
I used this steps: https://www.digitalocean.com/community/tutorials/how-to-install-ruby-on-rails-with-rbenv-on-ubuntu-14-04
2 -After, that you need to install "Install an X Server ". In my case, I installed Xming with default options.
3 - And the last step was to download and install the desktop version of RubyMine IDE:
I download the Linux version from RubyMine site and place on my D: drive after that I access to D: drive trough Bash " cd mnt/d " and continue to use these steps: https://makandracards.com/makandra/879-install-rubymine-under-ubuntu
Note: Before successfully installing RubyMine I had an error " java.lang.NoClassDefFoundError: Could not initialize class java.awt.Component " which I managed to fix with " " command.