grunt serve Warning: Running "sass:server" (sass) task

使用grunt　serve运行时遇到一问题：

y@y:ydkt$ grunt serve
Running "serve" task

Running "clean:server" (clean) task
Cleaning .tmp...OK

Running "env:all" (env) task

Running "injector:sass" (injector) task
Missing option `template`, using `dest` as template instead
Injecting scss files ( files)
>> Nothing changed

Running "concurrent:server" (concurrent) task
    Warning: Running "sass:server" (sass) task
    Warning:
    You need to have Ruby and Sass installed and in your PATH for this task to work.
    More info: https://github.com/gruntjs/grunt-contrib-sass
     Use --force to continue.

    Aborted due to warnings.

    Execution Time (-- :: UTC)
    loading tasks  209ms  ▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇ %
    sass:server      8ms  ▇▇ %
    Total 218ms Use --force to continue.

        Aborted due to warnings.

Execution Time (-- :: UTC)
loading tasks      114ms  ▇▇▇▇▇▇▇▇▇▇ %
serve               22ms  ▇▇ %
clean:server        92ms  ▇▇▇▇▇▇▇▇ %
injector:sass       94ms  ▇▇▇▇▇▇▇▇ %
concurrent:server  602ms  ▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇ %
Total 934ms

问题是：提示我Ruby 与Sass未进行安装配置：

Warning: Running "sass:server" (sass) task
    Warning:
    You need to have Ruby and Sass installed and in your PATH for this task to work.
    More info: https://github.com/gruntjs/grunt-contrib-sass
     Use --force to continue.

我　ruby -v　查看了以下ruby 版本为1.9.1 ubuntu已经进行预装了，查看了以下需要安装compass才可以编译sass．

下面进行安装compass：

y@y:ydkt$ sudo gem install compass
Fetching: sass-3.4..gem (%)
Fetching: multi_json-1.11..gem (%)
Fetching: compass-core-1.0..gem (%)
Fetching: compass-import-once-1.0..gem (%)
Fetching: chunky_png-1.3..gem (%)
Fetching: rb-fsevent-0.9..gem (%)
Fetching: ffi-1.9..gem (%)
Building native extensions.  This could take a while...
ERROR:  Error installing compass:
        ERROR: Failed to build gem native extension.

        /usr/bin/ruby1.9.1 extconf.rb
/usr/lib/ruby/1.9./rubygems/custom_require.rb::in `require': cannot load such file -- mkmf (LoadError)
        from /usr/lib/ruby/1.9./rubygems/custom_require.rb::in `require'
        from extconf.rb::in `<main>'

Gem files will remain installed in /var/lib/gems/1.9./gems/ffi-1.9. for inspection.
Results logged to /var/lib/gems/1.9./gems/ffi-1.9./ext/ffi_c/gem_make.out

提示我ruby 版本过低，

Gem files will remain installed in /var/lib/gems/1.9.1/gems/ffi-1.9.8 for inspection

下一步要更新我的ruby 版本，安装2.1.2

sudo apt-get -y update
sudo apt-get install cmake

sudo apt-get install -y build-essential zlib1g-dev libyaml-dev libssl-dev libgdbm-dev libreadline-dev
   libncurses5-dev libffi-dev curl git-core openssh-server redis-server postfix checkinstall libxml2-dev
  libxslt-dev libcurl4-openssl-dev libicu-dev mysql-client libmysqlclient-dev libreadline6-dev

curl --progress http://cache.ruby-lang.org/pub/ruby/2.1/ruby-2.1.2.tar.gz | tar xz
cd ruby-2.1.
./configure
make
sudo make install

安装成功：

y@y:~$ ruby -v
ruby 2.1.2p95 (-- revision ) [x86_64-linux]
y@y:~$ 

再次重新安装compass:

y@y:ydkt$ sudo gem install compass
[sudo] password for y:
Fetching: sass-3.4..gem (%)
Successfully installed sass-3.4.
Fetching: multi_json-1.11..gem (%)
Successfully installed multi_json-1.11.
Fetching: compass-core-1.0..gem (%)
Successfully installed compass-core-1.0.
Fetching: compass-import-once-1.0..gem (%)
Successfully installed compass-import-once-1.0.
Fetching: chunky_png-1.3..gem (%)
Successfully installed chunky_png-1.3.
Fetching: rb-fsevent-0.9..gem (%)
Successfully installed rb-fsevent-0.9.
Fetching: ffi-1.9..gem (%)
Building native extensions.  This could take a while...
Successfully installed ffi-1.9.
Fetching: rb-inotify-0.9..gem (%)
Successfully installed rb-inotify-0.9.
Fetching: compass-1.0..gem (%)
    Compass is charityware. If you love it, please donate on our behalf at http://umdf.org/compass Thanks!
Successfully installed compass-1.0.
Parsing documentation for chunky_png-1.3.
Installing ri documentation for chunky_png-1.3.
Parsing documentation for compass-1.0.
Installing ri documentation for compass-1.0.
Parsing documentation for compass-core-1.0.
Installing ri documentation for compass-core-1.0.
Parsing documentation for compass-import-once-1.0.
Installing ri documentation for compass-import-once-1.0.
Parsing documentation for ffi-1.9.
Installing ri documentation for ffi-1.9.
Parsing documentation for multi_json-1.11.
Installing ri documentation for multi_json-1.11.
Parsing documentation for rb-fsevent-0.9.
Installing ri documentation for rb-fsevent-0.9.
Parsing documentation for rb-inotify-0.9.
Installing ri documentation for rb-inotify-0.9.
Parsing documentation for sass-3.4.
Installing ri documentation for sass-3.4.
Done installing documentation for chunky_png, compass, compass-core, compass-import-once, ffi, multi_json, rb-fsevent, rb-inotify, sass after  seconds
 gems installed

此时执行grunt serve,之前的错误已经没有了，但是又出现了新的错误：

Running "open:server" (open) task
Warning: Command failed: /bin/sh -c /home/y/my_git/ydkt/node_modules/open/vendor/xdg-open "http://localhost:9000"
/bin/sh: : /home/y/my_git/ydkt/node_modules/open/vendor/xdg-open: Permission denied
 Use --force to continue.

Aborted due to warnings.

提示：拒绝访问！修改文件权限：

y@y:open$ cd vendor/
y@y:vendor$ chmod  xdg-open
y@y:vendor$ ll
总用量
drwxrwxr-x  y y    5月  : ./
drwxrwxr-x  y y    5月  : ../
-rwxrwxrwx  y y   5月  : xdg-open*
y@y:vendor$ 

最后执行grunt serve成功！！！