unicornとrailsを実行したいが長文のエラーが出てしまう。

前提・実現したいこと

unicornとrailsで環境を構築したいのですが、大量のエラーが出て何が原因かが全く分かりません。

発生している問題・エラーメッセージ

INFO -- : Refreshing Gem list
/var/www/html/Pet_/vendor/bundle/ruby/2.5.0/gems/bootsnap-1.7.5/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in `require': libssl.so.10: cannot open shared object file: No such file or directory - /var/www/html/Pet_/vendor/bundle/ruby/2.5.0/gems/mysql2-0.5.3/lib/mysql2/mysql2.so (LoadError)
	from /var/www/html/Pet_/vendor/bundle/ruby/2.5.0/gems/bootsnap-1.7.5/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in `block in require_with_bootsnap_lfi'
	from /var/www/html/Pet_/vendor/bundle/ruby/2.5.0/gems/bootsnap-1.7.5/lib/bootsnap/load_path_cache/loaded_features_index.rb:92:in `register'
	from /var/www/html/Pet_/vendor/bundle/ruby/2.5.0/gems/bootsnap-1.7.5/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:22:in `require_with_bootsnap_lfi'
	from /var/www/html/Pet_/vendor/bundle/ruby/2.5.0/gems/bootsnap-1.7.5/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:31:in `require'
	from /var/www/html/Pet_/vendor/bundle/ruby/2.5.0/gems/mysql2-0.5.3/lib/mysql2.rb:36:in `<top (required)>'
	from /var/www/html/Pet_/vendor/bundle/ruby/2.5.0/gems/bootsnap-1.7.5/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in `require'
	from /var/www/html/Pet_/vendor/bundle/ruby/2.5.0/gems/bootsnap-1.7.5/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in `block in require_with_bootsnap_lfi'
	from /var/www/html/Pet_/vendor/bundle/ruby/2.5.0/gems/bootsnap-1.7.5/lib/bootsnap/load_path_cache/loaded_features_index.rb:92:in `register'
	from /var/www/html/Pet_/vendor/bundle/ruby/2.5.0/gems/bootsnap-1.7.5/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:22:in `require_with_bootsnap_lfi'
	from /var/www/html/Pet_/vendor/bundle/ruby/2.5.0/gems/bootsnap-1.7.5/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:31:in `require'
	from /home/ec2-user/.rvm/rubies/ruby-2.5.3/lib/ruby/site_ruby/2.5.0/bundler/runtime.rb:81:in `block (2 levels) in require'
	from /home/ec2-user/.rvm/rubies/ruby-2.5.3/lib/ruby/site_ruby/2.5.0/bundler/runtime.rb:76:in `each'
	from /home/ec2-user/.rvm/rubies/ruby-2.5.3/lib/ruby/site_ruby/2.5.0/bundler/runtime.rb:76:in `block in require'
	from /home/ec2-user/.rvm/rubies/ruby-2.5.3/lib/ruby/site_ruby/2.5.0/bundler/runtime.rb:65:in `each'
	from /home/ec2-user/.rvm/rubies/ruby-2.5.3/lib/ruby/site_ruby/2.5.0/bundler/runtime.rb:65:in `require'
	from /home/ec2-user/.rvm/rubies/ruby-2.5.3/lib/ruby/site_ruby/2.5.0/bundler.rb:114:in `require'
	from /var/www/html/Pet_/config/application.rb:7:in `<top (required)>'
	from /var/www/html/Pet_/config/environment.rb:2:in `require_relative'
	from /var/www/html/Pet_/config/environment.rb:2:in `<top (required)>'
	from config.ru:4:in `require_relative'
	from config.ru:4:in `block in <main>'
	from /var/www/html/Pet_/vendor/bundle/ruby/2.5.0/gems/rack-2.2.3/lib/rack/builder.rb:125:in `instance_eval'
	from /var/www/html/Pet_/vendor/bundle/ruby/2.5.0/gems/rack-2.2.3/lib/rack/builder.rb:125:in `initialize'
	from config.ru:1:in `new'
	from config.ru:1:in `<main>'
	from /var/www/html/Pet_/vendor/bundle/ruby/2.5.0/gems/unicorn-6.0.0/lib/unicorn.rb:54:in `eval'
	from /var/www/html/Pet_/vendor/bundle/ruby/2.5.0/gems/unicorn-6.0.0/lib/unicorn.rb:54:in `block in builder'
	from /var/www/html/Pet_/vendor/bundle/ruby/2.5.0/gems/unicorn-6.0.0/bin/unicorn_rails:139:in `block in rails_builder'
	from /var/www/html/Pet_/vendor/bundle/ruby/2.5.0/gems/unicorn-6.0.0/lib/unicorn/http_server.rb:826:in `build_app!'
	from /var/www/html/Pet_/vendor/bundle/ruby/2.5.0/gems/unicorn-6.0.0/lib/unicorn/http_server.rb:140:in `start'
	from /var/www/html/Pet_/vendor/bundle/ruby/2.5.0/gems/unicorn-6.0.0/bin/unicorn_rails:209:in `<top (required)>'
	from /var/www/html/Pet_/vendor/bundle/ruby/2.5.0/bin/unicorn_rails:23:in `load'
	from /var/www/html/Pet_/vendor/bundle/ruby/2.5.0/bin/unicorn_rails:23:in `<main>'
	from /var/www/html/Pet_/vendor/bundle/ruby/2.5.0/bin/ruby_executable_hooks:24:in `eval'
	from /var/www/html/Pet_/vendor/bundle/ruby/2.5.0/bin/ruby_executable_hooks:24:in `<main>'

/var/www/html/Pet_/が公開フォルダです。

試したこと

・LoadErrorが見えるのでそれぞれのファイルを確認しましたが、パス通り存在していました。
・unicornとrubyのバージョン違いの問題かもしれないとの事を見つけたのでunicornのバージョンも一度下げてみましたが無意味でした。
・上に逆の発想で Refreshing Gem listと出ているので、全てをbundle upgrade最新のものにしてみましたが無意味でした。