Invalid Configuration or No Rubies Listed

Invalid configuration or no Rubies listed. Please fix 'config.yml' and rerun 'ruby dk.rb install'

Try:

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- G:\Ruby22-x64

The YAML syntax says you need the 3 dashes at the top and then both the dash and space (-)

Only one version of Ruby works when multiple versions are installed

I had the exact same issue, except using rbenv with bash.

The perpetrator seems to be the echo "export RUBYOPT='-W:no-deprecated -W:no-experimental'" line in your .zsh file, I'm not sure if Ruby 2.6.5 understands it.

Remove echo "export RUBYOPT='-W:no-deprecated -W:no-experimental'" from your .zsh / .bashrc / .profile and restart your shell.

Ruby RVM apt-get update error

RVM doesn't behave well if apt-get update has errors. If your apt sources have an invalid repository that gives 404 or GPG error, RVM will refuse to work. This can be confusing because it happens even if the faulty repository has nothing to do with ruby or RVM.

The following fix worked for me (Ubuntu):

Run apt-get update and see if there are any errors. Edit your sources.list and precise.list in /etc/apt to remove the faulty repositories. Repeat until apt-get update succeeds without any errors. Then try running RVM.

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