for user friendly we should add apt-get update first at ---> apt-get update &&...

for user friendly we should add apt-get update first at ---> apt-get update && apt-get install -y vim

doc/fluid/install/compile/compile_CentOS_en.md

@@ -154,7 +154,7 @@ Please follow the steps below to install:
 
 Congratulations, now that you have successfully installed PaddlePaddle using Docker, you only need to run PaddlePaddle after entering the Docker container. For more Docker usage, please refer to the [official Docker documentation](https://docs.docker.com/).
 
-> Note: In order to reduce the size, `vim` is not installed in PaddlePaddle Docker image by default. You can edit the code in the container after executing `apt-get install -y vim` in the container.
+> Note: In order to reduce the size, `vim` is not installed in PaddlePaddle Docker image by default. You can edit the code in the container after executing `apt-get update && apt-get install -y vim` in the container.
 
 <a name="ct_source"></a>
 ### **Local compilation**

doc/fluid/install/compile/compile_Ubuntu.md

@@ -152,7 +152,7 @@
 
 恭喜，至此您已完成PaddlePaddle的编译安装。您只需要进入Docker容器后运行PaddlePaddle，即可开始使用。更多Docker使用请参见[Docker官方文档](https://docs.docker.com)
 
-> 注：PaddlePaddle Docker镜像为了减小体积，默认没有安装`vim`，您可以在容器中执行 `apt-get install -y vim` 来安装。
+> 注：PaddlePaddle Docker镜像为了减小体积，默认没有安装`vim`，您可以在容器中执行 `apt-get update && apt-get install -y vim` 来安装。
 
 <a name="ubt_source"></a>
 ### **本机编译**

doc/fluid/install/compile/compile_Ubuntu_en.md

@@ -151,7 +151,7 @@ Please follow the steps below to install:
 
 Congratulations, now you have completed the compilation and installation of PaddlePaddle. You only need to enter the Docker container and run PaddlePaddle to start using. For more Docker usage, please refer to [official docker documentation](https://docs.docker.com)
 
-> Note: In order to reduce the size, `vim` is not installed in PaddlePaddle Docker image by default. You can edit the code in the container after executing `apt-get install -y vim` in the container.
+> Note: In order to reduce the size, `vim` is not installed in PaddlePaddle Docker image by default. You can edit the code in the container after executing `apt-get update && apt-get install -y vim` in the container.
 
 <a name="ubt_source"></a>
 ### ***Local compilation***