Ubuntu 14.04 Rails 缺少文件

Question

在安装 Rails 时，一切都很好，但我写道：

rails -v

和输出：

/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)
from /home/toshiba/.rvm/rubies/ruby-2.2.1/lib/ruby/site_ruby/2.2.0/rubygems/core_ext/kernel_require.rb:54:in `require'
from /usr/bin/rails:7:in `<main>'

大家都知道怎么做吗？

我用过这个教程：http://installfest.railsbridge.org/

是的，我跑了：

gem install rails

我注意到当我运行 install rails 时会弹出这个东西

Building native extensions.  This could take a while...
ERROR:  Error installing rails:
ERROR: Failed to build gem native extension.

/home/toshiba/.rvm/rubies/ruby-2.2.1/bin/ruby -r ./siteconf20150816-3818-sm5w21.rb extconf.rb
checking if the C compiler accepts -ggdb3 -O0 -std=c99 -Wall -Werror... yes
Building nokogiri using packaged libraries.
checking for gzdopen() in -lz... no
zlib is missing; necessary for building libxml2
*** extconf.rb failed ***
Could not create Makefile due to some reason, probably lack of necessary
libraries and/or headers.  Check the mkmf.log file for more details.     You 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 will remain installed in /home/toshiba/.rvm/gems/ruby-2.2.1/gems/nokogiri-1.6.6.2 for inspection.
Results logged to /home/toshiba/.rvm/gems/ruby-2.2.1/extensions/x86_64-linux/2.2.0/nokogiri-1.6.6.2/gem_make.out

好像不好

Answer 1

我已经解决了这个问题

sudo apt-get install zlib1g-dev

Answer 2

这会在您的安装过程中弹出：

zlib is missing; necessary for building libxml2

我猜你需要sudo apt-get install libxml2。

编辑我被否决了，可能关于安装zlib 的答案是（更多？）正确的。我想知道安装 libxml2（或 libxml2-dev）是否也会有所帮助，遗憾的是没有关于该实验的输出的评论。