Iniciar console rails

Tó com esse problema quando tento iniciar o console do rails

erlon@lonlon:~/projeto_ruby/vota_prato$ rails console
/usr/local/lib/ruby/1.9.1/yaml.rb:56:in `<top (required)>':
It seems your ruby installation is missing psych (for YAML output).
To eliminate this warning, please install libyaml and reinstall your ruby.
/usr/local/lib/ruby/1.9.1/irb/completion.rb:9:in `require': cannot load such file -- readline (LoadError)
	from /usr/local/lib/ruby/1.9.1/irb/completion.rb:9:in `<top (required)>'
	from /usr/local/lib/ruby/gems/1.9.1/gems/railties-3.2.0/lib/rails/commands/console.rb:3:in `require'
	from /usr/local/lib/ruby/gems/1.9.1/gems/railties-3.2.0/lib/rails/commands/console.rb:3:in `<top (required)>'
	from /usr/local/lib/ruby/gems/1.9.1/gems/railties-3.2.0/lib/rails/commands.rb:38:in `require'
	from /usr/local/lib/ruby/gems/1.9.1/gems/railties-3.2.0/lib/rails/commands.rb:38:in `<top (required)>'
	from script/rails:6:in `require'
	from script/rails:6:in `<main>'
erlon@lonlon:~/projeto_ruby/vota_prato$ 

alguém já passou por isso e pode me ajudar ?