When trying to bundle install on a Gemfile that contained only the GitHub Pages gem and nothing else, on Ubuntu 18.04, I got error messages telling me to try installing eventmachine using gem install. That always succeeds, but bundle install still fails. How can I get bundler to see that the gem is installed?
I fixed this after many hours of struggle, by noticing that on the GitHub Pages repo there's a note that says
Important: Make sure you have Bundler > v1.14 by running gem update bundler in your terminal before following the next steps.
I have no idea why this mattered but I removed my ruby packages from Ubuntu and reinstalled them, then installed bundler with rubygems, which gave me a newer version:
sudo apt-get remove ruby
sudo apt-get install ruby ruby-dev
sudo gem install bundler
bundler --version
If anyone knows why I needed that version of bundler, or how I should have diagnosed this faster, I'd be interested to hear it. I'm not new to programming but I'm new to Ruby.