<p>Still didn't work.<br>
But I found a solution at <a href="https://stackoverflow.com/questions/54087856/cant-find-gem-bundler-0-a-with-executable-bundle-gemgemnotfoundexceptio/54088452" rel="nofollow">https://stackoverflow.com/questions/54087856/cant-find-gem-bundler-0-a-with-executable-bundle-gemgemnotfoundexceptio/54088452</a></p>
<p>I had to run <code>gem update --system</code>, then <code>bundle install</code> worked</p>

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