Ubuntu 14.04 安装 jekyll | 积跬步，至千里。

先执行下面命令，

sudo apt-get update
sudo apt-get upgrade
//这个命令可能需要，
sudo apt-get install ruby

然后执行

sudo apt-get install rubygems

结果竟然报错了

Reading package lists... Done
Building dependency tree       
Reading state information... Done
 Package rubygems is not available , but is referred to by another package.
 This may mean that the package is missing , has been obsoleted , or
is only available from another source
However the following packages replace it:
  ruby

E: Package 'rubygems' has no installation candidate

然后在网上查找，需要使用下面的命令，

sudo apt-get install rubygems-integration

然后就是开始安装 jekyll 吧

sudo gem install jekyll

然后又报错了，错误信息如下。真是一步一个坑啊。

ERROR:  Error installing jekyll:
  public_suffix requires Ruby version >= 2.1.

于是我查看了一下自己的 Ruby 版本，ruby -v 结果发现还真是低啊，才1.9.3 那就想办法升级 Ruby 的版本吧，然后就找到了下面的命令

dpkg --get-selections | grep -i ruby

当提示下面的信息的时候，说明最新版本的 Ruby 安装成功了

Install of ruby-2.4.1 - #complete
 Ruby was built without documentation , to build it run: rvm docs generate-ri
Creating alias default for ruby-2.4.1...

  * To start using RVM you need to run `source /home/hoyouly/.rvm/scripts/rvm`
 in all your open shell windows , in rare cases you need to reopen all shell windows.

虽然英语不咋地，但是发现

Install of ruby-2.4.1 - #complete 说明Ruby 2.4.1 版本安装成功
To start using RVM you need to run `source /home/hoyouly/.rvm/scripts/rvm ，需要运行下面命令，那就运行吧
```
source /home/hoyouly/.rvm/scripts/rvm
```
为了保险期间，还是查看 Ruby 版本

ruby -v
//结果如下
ruby 2.4.1p111 (2017-03-22 revision 58053) [x86_64-linux]

版本号变了，2.4.1 ，版本好变了就行，那就继续安装 jekyll 吧，

sudo gem install  jekyll

TNN 的又报错了，还是和之前的错误一样， WTF ，不是版本号已经变了，怎么还提示public_suffix requires Ruby version >= 2.1这个错误呢，终于在 github 上找到原因了，

原来尽管你 ruby -v 得到的版本号是 2.4.1 ，可是当你 sudo ruby -v 结果还是1.9.3 而你安装 jekyll 的时候，使用了 sudo 命令，会自动查找 sudo ruby -v 对应的版本，所以安装 jekyll 的时候，不使用 sudo 就可以了，
具体原因参考 glynhudson 的回答那就执行真正的安装 jekyll 的命令吧,注意注意，千万不能加 sudo

gem install  jekyll

终于没报错了，提示下面下面信息

Installing ri documentation for jekyll-3.7.3
 Done installing documentation for public_suffix , addressable , colorator , http_parser.rb, eventmachine , em-websocket, concurrent-ruby, i18n , rb-fsevent, ffi , rb-inotify, sass-listen, sass , jekyll-sass-converter, ruby_dep , listen , jekyll-watch, kramdown , liquid , mercenary , forwardable-extended, pathutil , rouge , safe_yaml , jekyll after 32 seconds
25 gems installed

同样，为了保险期间，还是查看一个 jekyll 的版本号

jekyll -v

//结果如下
jekyll 3.7.3

这次就说明真的在 Ubuntu 上安装成功 jekyll 了，那就试一把把进入到我的 bolg 文件目录下面，执行

jekyll build

原本以为水到渠成的事情，结果有出错了，

Deprecation: The 'gems' configuration option has been renamed to 'plugins'. Please update your config file accordingly.
Dependency Error: Yikes! It looks like you don't have jekyll-sitemap or one of its dependencies installed. In order to use Jekyll as currently configured, you'll need to install this gem. The full error message from Ruby is: 'cannot load such file - jekyll-sitemap' If you run into trouble, you can find helpful resources at https://jekyllrb.com/help/!

Deprecation 这个先不管它，可是下面却有一个 error message ，这是为啥呢，继续百度， Google 咯，既然cannot load such file - jekyll-sitemap ，那我就 install 一个这样的文件不就得了，

gem install  jekyll-sitemap

然后继续 jekyll build 的时候，还遇到了相同的错误。只不过缺少的文件名不同，那就照猫画虎咯，继续安装缺少的文件

Dependency Error: Yikes! It looks like you don't have jekyll-feed or one of its dependencies installed. In order to use Jekyll as currently configured, you'll need to install this gem. The full error message from Ruby is: 'cannot load such file - jekyll-jekyll-seo-tag' If you run into trouble, you can find helpful resources at https://jekyllrb.com/help/!

Dependency Error: Yikes! It looks like you don't have jekyll-feed or one of its dependencies installed. In order to use Jekyll as currently configured, you'll need to install this gem. The full error message from Ruby is: 'cannot load such file - jekyll-feed' If you run into trouble, you can find helpful resources at https://jekyllrb.com/help/!

gem install  jekyll-seo-tag

gem install  jekyll-feed

接下来继续执行

jeklly build

没有报错了，然后启动服务

jekyll server

在浏览器中输入： http://localhost:4000/ 完美。

说明：配置中出了各种问题，也查了一些资料，可能不完全，也忘记了都出自那个博客上的了，就不写搬运地址了，有对不住的地方，见谅。