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Jerkmate
https://guides.rubygems.org/bundler_2_upgrade/
How to Upgrade to Bundler 2 - RubyGems Guides
Tutorials, guides, FAQs for RubyGems package management
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https://blog.rubygems.org/2018/11/04/an-update-on-bundler-2.html
An Update on Bundler 2.0 - RubyGems Blog
bundler 2rubygems blogupdate0
https://jameshfisher.com/2019/01/09/how-to-fix-activating-bundler-2-failed-error-in-your-jekyll-build/
How to fix 'Activating bundler ( 2) failed' error in your jekyll build
Jekyll build breaks due to Bundler 2 incompatibility. Fixed by removing Bundler 1 version from Gemfile.lock.
bundler 2failed errorfixactivatingjekyll