Could not find gem 'scss_lint'

[msharp1]

• [ ] I believe this to be a bug, not a question about using Crisp Minimal Résumé.
• [ ] This is a feature request.

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My OS

• [ ] I am on (or have tested on) macOS 10+
• [X] I am on (or have tested on) Ubuntu GNU/Linux (20.04)
• [ ] I am on (or have tested on) Other GNU/Linux
• [ ] I am on (or have tested on) Windows 10+

My Ruby/Jekyll Version

ruby --version ruby 2.7.0p0 (2019-12-25 revision 647ee6f091) [x86_64-linux-gnu] jekyll --version jekyll 4.2.0

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My Issue

• [ ] I cannot install Gem.
• [ ] I cannot run/debug the theme locally.
• [ ] My résumé does not render correctly.
• [ ] My résumé has problem with Github Pages.
• [X] Other. (Replace with your description here.)

scss_lint gem cannot be found

My Reproduction Steps

• Follow https://jekyllrb.com/docs/installation/ubuntu/
• git clone https://github.com/crispgm/resume.git
• cd resume
• jekyll serve

I get:

Traceback (most recent call last):
    15: from /home/martin/gems/bin/jekyll:23:in `<main>'
    14: from /home/martin/gems/bin/jekyll:23:in `load'
    13: from /home/martin/gems/gems/jekyll-4.2.0/exe/jekyll:11:in `<top (required)>'
    12: from /home/martin/gems/gems/jekyll-4.2.0/lib/jekyll/plugin_manager.rb:52:in `require_from_bundler'
    11: from /usr/lib/ruby/2.7.0/bundler.rb:149:in `setup'
    10: from /usr/lib/ruby/2.7.0/bundler/runtime.rb:20:in `setup'
     9: from /usr/lib/ruby/2.7.0/bundler/runtime.rb:101:in `block in definition_method'
     8: from /usr/lib/ruby/2.7.0/bundler/definition.rb:226:in `requested_specs'
     7: from /usr/lib/ruby/2.7.0/bundler/definition.rb:237:in `specs_for'
     6: from /usr/lib/ruby/2.7.0/bundler/definition.rb:170:in `specs'
     5: from /usr/lib/ruby/2.7.0/bundler/definition.rb:258:in `resolve'
     4: from /usr/lib/ruby/2.7.0/bundler/resolver.rb:22:in `resolve'
     3: from /usr/lib/ruby/2.7.0/bundler/resolver.rb:49:in `start'
     2: from /usr/lib/ruby/2.7.0/bundler/resolver.rb:258:in `verify_gemfile_dependencies_are_found!'
     1: from /usr/lib/ruby/2.7.0/bundler/resolver.rb:258:in `each'
/usr/lib/ruby/2.7.0/bundler/resolver.rb:290:in `block in verify_gemfile_dependencies_are_found!': Could not find gem 'scss_lint' in any of the gem sources listed in your Gemfile. (Bundler::GemNotFound)

[crispgm]

please use bundle exec jekyll serve, because scss_lint is declared to be required by Gemfile.