remove unused ubuntu Debian install doc

Author: luotao1

doc/getstarted/build_and_install/index_cn.rst

@@ -6,14 +6,12 @@
 安装流程
 ++++++++
 
-PaddlePaddle提供数个预编译的二进制来进行安装，包括Docker镜像，ubuntu的deb安装包等。我们推荐使用Docker镜像来部署环境，同时欢迎贡献更多的安装包。
+PaddlePaddle提供Docker镜像来部署环境。
 
 .. toctree::
  :maxdepth: 1
 
  docker_install_cn.rst 
- ubuntu_install_cn.rst
-
 
 
 编译流程

doc/getstarted/build_and_install/index_en.rst

@@ -8,14 +8,13 @@ Install PaddlePaddle
  :maxdepth: 1
 
  docker_install_en.rst
- ubuntu_install_en.rst
 
 Build from Source
 -----------------
 
 .. warning::
 
- Please use :code:`deb` package or :code:`docker` image to install paddle. The building guide is used for hacking or contributing PaddlePaddle source code.
+ Please use :code:`docker` image to install paddle. The building guide is used for hacking or contributing PaddlePaddle source code.
 
 .. toctree::
  :maxdepth: 1