ruby - Ubuntu 14.04 Rails missing file -

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when installing rails, then, write:

rails -v

and output:

/home/toshiba/.rvm/rubies/ruby-2.2.1/lib/ruby/site_ruby/2.2.0/rubygems/core_ext/kernel_require.rb:54:in `require': cannot load such file -- rails/cli (loaderror) /home/toshiba/.rvm/rubies/ruby-2.2.1/lib/ruby/site_ruby/2.2.0/rubygems/core_ext/kernel_require.rb:54:in `require' /usr/bin/rails:7:in `<main>'

everyone know how it?

i used tutorial: http://installfest.railsbridge.org/

and yes, run:

gem install rails

i noticed when run install rails thing pop up

building native extensions.  take while... error:  error installing rails: error: failed build gem native extension.  /home/toshiba/.rvm/rubies/ruby-2.2.1/bin/ruby -r ./siteconf20150816-3818-sm5w21.rb extconf.rb checking if c compiler accepts -ggdb3 -o0 -std=c99 -wall -werror... yes building nokogiri using packaged libraries. checking gzdopen() in -lz... no zlib missing; necessary building libxml2 *** extconf.rb failed *** not create makefile due reason, lack of necessary libraries and/or headers.  check mkmf.log file more details.     may need configuration options.  provided configuration options: --with-opt-dir --without-opt-dir --with-opt-include --without-opt-include=${opt-dir}/include --with-opt-lib --without-opt-lib=${opt-dir}/lib --with-make-prog --without-make-prog --srcdir=. --curdir --ruby=/home/toshiba/.rvm/rubies/ruby-2.2.1/bin/$(ruby_base_name) --help --clean --use-system-libraries --enable-static --disable-static --with-zlib-dir --without-zlib-dir --with-zlib-include --without-zlib-include=${zlib-dir}/include --with-zlib-lib --without-zlib-lib=${zlib-dir}/lib --enable-cross-build --disable-cross-build  extconf failed, exit code 1  gem files remain installed in /home/toshiba/.rvm/gems/ruby-2.2.1/gems/nokogiri-1.6.6.2 inspection. results logged /home/toshiba/.rvm/gems/ruby-2.2.1/extensions/x86_64-linux/2.2.0/nokogiri-1.6.6.2/gem_make.out

it seems bad

i've fixed problem by

sudo apt-get install zlib1g-dev

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