Ruby环境安装混乱导致无法安装Jekyll的问题求助

尝试使用Jekyll搭建GitHub Pages，反复执行sudo apt-get install ruby-full和sudo apt-get remove ruby-full后，Ruby环境出现混乱。

当前系统状态 #

$ ruby -v
ruby 2.7.0p0 (2019-12-25 revision 647ee6f091) [x86_64-linux-gnu]
$ gem -v
3.1.2

安装Jekyll时的报错 #

执行gem install jekyll出现以下错误：

$ gem install jekyll
ERROR:  Error installing jekyll:
    The last version of sass-embedded (~> 1.54) to support your Ruby & RubyGems was 1.58.0. Try installing it with `gem install sass-embedded -v 1.58.0` and then running the current command again
    sass-embedded requires RubyGems version >= 3.3.22. The current RubyGems version is 3.1.2. Try 'gem update --system' to update RubyGems itself.

更新RubyGems失败日志 #

执行gem update --system更新Gem时失败：

$ gem update --system
Updating rubygems-update
Successfully installed rubygems-update-3.4.6
Parsing documentation for rubygems-update-3.4.6
Done installing documentation for rubygems-update after 0 seconds
Parsing documentation for rubygems-update-3.4.6
Done installing documentation for rubygems-update after 0 seconds
Installing RubyGems 3.4.6
Traceback (most recent call last):
    5: from setup.rb:22:in `<main>'
    4: from setup.rb:22:in `require'
    3: from /home/jarret/gems/gems/rubygems-update-3.4.6/lib/rubygems.rb:1332:in `<top (required)>'
    2: from /home/jarret/gems/gems/rubygems-update-3.4.6/lib/rubygems.rb:1332:in `require'
    1: from /usr/lib/ruby/vendor_ruby/rubygems/defaults/operating_system.rb:49:in `<top (required)>'
/usr/lib/ruby/vendor_ruby/rubygems/defaults/operating_system.rb:50:in `<class:Specification>': undefined method `rubyforge_project=' for class `Gem::Specification' (NameError)
    3: from setup.rb:22:in `<main>'
    2: from setup.rb:22:in `require'
    1: from /home/jarret/gems/gems/rubygems-update-3.4.6/lib/rubygems.rb:1328:in `<top (required)>'
/home/jarret/gems/gems/rubygems-update-3.4.6/lib/rubygems.rb:1342:in `rescue in <top (required)>': undefined method `rubyforge_project=' for class `Gem::Specification' (NameError)
Loading the /usr/lib/ruby/vendor_ruby/rubygems/defaults/operating_system.rb file caused an error. This file is owned by your OS, not by rubygems upstream. Please find out which OS package this file belongs to and follow the guidelines from your OS to report the problem and ask for help.

RubyGems环境信息 #

$ gem env
RubyGems Environment:
  - RUBYGEMS VERSION: 3.1.2
  - RUBY VERSION: 2.7.0 (2019-12-25 patchlevel 0) [x86_64-linux-gnu]
  - INSTALLATION DIRECTORY: /home/jarret/gems
  - USER INSTALLATION DIRECTORY: /home/jarret/.gem/ruby/2.7.0
  - RUBY EXECUTABLE: /usr/bin/ruby2.7
  - GIT EXECUTABLE: /usr/bin/git
  - EXECUTABLE DIRECTORY: /home/jarret/gems/bin
  - SPEC CACHE DIRECTORY: /home/jarret/.gem/specs
  - SYSTEM CONFIGURATION DIRECTORY: /etc
  - RUBYGEMS PLATFORMS:
    - ruby
    - x86_64-linux
  - GEM PATHS:
     - /home/jarret/gems
     - /home/jarret/.gem/ruby/2.7.0
     - /var/lib/gems/2.7.0
     - /usr/lib/ruby/gems/2.7.0
     - /usr/share/rubygems-integration/2.7.0
     - /usr/share/rubygems-integration/all
     - /usr/lib/x86_64-linux-gnu/rubygems-integration/2.7.0
  - GEM CONFIGURATION:
     - :update_sources => true
     - :verbose => true
     - :backtrace => false
     - :bulk_threshold => 1000
  - REMOTE SOURCES:
     - https://rubygems.org/
  - SHELL PATH:
     - /home/jarret/gems/bin
     - /home/jarret/miniconda3/condabin
     - /usr/local/sbin
     - /usr/local/bin
     - /usr/sbin
     - /usr/bin
     - /sbin
     - /bin
     - /usr/games
     - /usr/local/games
     - /snap/bin
     - /opt/fiji/Fiji.app

已多次尝试卸载重装Ruby和Gem，也尝试过更新，但问题仍未解决，恳请帮助。

内容的提问来源于stack exchange，提问作者Adrian Jarret