-7
[email protected]:~/Desktop/website/myweb$ rails server
/home/dani/.rbenv/versions/2.4.0/lib/ruby/gems/2.4.0/gems/mysql2-0.4.5/lib/mysql2.rb:31:in `require': libmysqlclient.so.20: cannot open shared object file: No such file or directory - /home/dani/.rbenv/versions/2.4.0/lib/ruby/gems/2.4.0/gems/mysql2-0.4.5/lib/mysql2/mysql2.so (LoadError)
from /home/dani/.rbenv/versions/2.4.0/lib/ruby/gems/2.4.0/gems/mysql2-0.4.5/lib/mysql2.rb:31:in `<top (required)>'
from /home/dani/.rbenv/versions/2.4.0/lib/ruby/gems/2.4.0/gems/bundler-1.15.1/lib/bundler/runtime.rb:82:in `require'
from /home/dani/.rbenv/versions/2.4.0/lib/ruby/gems/2.4.0/gems/bundler-1.15.1/lib/bundler/runtime.rb:82:in `block (2 levels) in require'
from /home/dani/.rbenv/versions/2.4.0/lib/ruby/gems/2.4.0/gems/bundler-1.15.1/lib/bundler/runtime.rb:77:in `each'
from /home/dani/.rbenv/versions/2.4.0/lib/ruby/gems/2.4.0/gems/bundler-1.15.1/lib/bundler/runtime.rb:77:in `block in require'
from /home/dani/.rbenv/versions/2.4.0/lib/ruby/gems/2.4.0/gems/bundler-1.15.1/lib/bundler/runtime.rb:66:in `each'
from /home/dani/.rbenv/versions/2.4.0/lib/ruby/gems/2.4.0/gems/bundler-1.15.1/lib/bundler/runtime.rb:66:in `require'
from /home/dani/.rbenv/versions/2.4.0/lib/ruby/gems/2.4.0/gems/bundler-1.15.1/lib/bundler.rb:108:in `require'
from /home/dani/Desktop/website/myweb/config/application.rb:7:in `<top (required)>'
from /home/dani/.rbenv/versions/2.4.0/lib/ruby/gems/2.4.0/gems/railties-5.0.2/lib/rails/commands/commands_tasks.rb:88:in `require'
from /home/dani/.rbenv/versions/2.4.0/lib/ruby/gems/2.4.0/gems/railties-5.0.2/lib/rails/commands/commands_tasks.rb:88:in `block in server'
from /home/dani/.rbenv/versions/2.4.0/lib/ruby/gems/2.4.0/gems/railties-5.0.2/lib/rails/commands/commands_tasks.rb:85:in `tap'
from /home/dani/.rbenv/versions/2.4.0/lib/ruby/gems/2.4.0/gems/railties-5.0.2/lib/rails/commands/commands_tasks.rb:85:in `server'
from /home/dani/.rbenv/versions/2.4.0/lib/ruby/gems/2.4.0/gems/railties-5.0.2/lib/rails/commands/commands_tasks.rb:49:in `run_command!'
from /home/dani/.rbenv/versions/2.4.0/lib/ruby/gems/2.4.0/gems/railties-5.0.2/lib/rails/commands.rb:18:in `<top (required)>'
from /home/dani/Desktop/website/myweb/bin/rails:9:in `require'
from /home/dani/Desktop/website/myweb/bin/rails:9:in `<top (required)>'
from /home/dani/.rbenv/versions/2.4.0/lib/ruby/gems/2.4.0/gems/spring-2.0.1/lib/spring/client/rails.rb:28:in `load'
from /home/dani/.rbenv/versions/2.4.0/lib/ruby/gems/2.4.0/gems/spring-2.0.1/lib/spring/client/rails.rb:28:in `call'
from /home/dani/.rbenv/versions/2.4.0/lib/ruby/gems/2.4.0/gems/spring-2.0.1/lib/spring/client/command.rb:7:in `call'
from /home/dani/.rbenv/versions/2.4.0/lib/ruby/gems/2.4.0/gems/spring-2.0.1/lib/spring/client.rb:30:in `run'
from /home/dani/.rbenv/versions/2.4.0/lib/ruby/gems/2.4.0/gems/spring-2.0.1/bin/spring:49:in `<top (required)>'
from /home/dani/.rbenv/versions/2.4.0/lib/ruby/gems/2.4.0/gems/spring-2.0.1/lib/spring/binstub.rb:31:in `load'
from /home/dani/.rbenv/versions/2.4.0/lib/ruby/gems/2.4.0/gems/spring-2.0.1/lib/spring/binstub.rb:31:in `<top (required)>'
from /home/dani/.rbenv/versions/2.4.0/lib/ruby/site_ruby/2.4.0/rubygems/core_ext/kernel_require.rb:68:in `require'
from /home/dani/.rbenv/versions/2.4.0/lib/ruby/site_ruby/2.4.0/rubygems/core_ext/kernel_require.rb:68:in `require'
from /home/dani/Desktop/website/myweb/bin/spring:15:in `<top (required)>'
from bin/rails:3:in `load'
from bin/rails:3:in `<main>'
端末から 'sudo apt-get install libmysqlclient-dev'を実行してください。 – Emu
投稿用のヒント：（1）コンソール出力とログファイルをフォーマットします。 （2）タイトルを除いて文脈のないエラーダンプは、偉大な努力がなされていないように見え、下降音を誘引する可能性がある、（3）読者はあなたが助けを必要としていることを知っているので、 （4）あなたが問題を解決するためにどのような研究をしたかを教えてください。エラーを検索しましたか？ – halfer
[ここに多数の重複]（https://duckduckgo.com/?q=rails+libmysqlclient.so.20%3A+cannot+open+shared+object+file%3A+No+such+file） – halfer