From e771b91a11df5e5bead9a2ec57e688dcab12f19a Mon Sep 17 00:00:00 2001
From: xsrobin <50069408+xsrobin@users.noreply.github.com>
Date: Tue, 25 Jun 2019 16:09:58 +0800
Subject: [PATCH] Update install_Ubuntu.md (#924)

---
 doc/fluid/beginners_guide/install/install_Ubuntu.md | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/doc/fluid/beginners_guide/install/install_Ubuntu.md b/doc/fluid/beginners_guide/install/install_Ubuntu.md
index 8e089377f..3f6492d6c 100644
--- a/doc/fluid/beginners_guide/install/install_Ubuntu.md
+++ b/doc/fluid/beginners_guide/install/install_Ubuntu.md
@@ -22,6 +22,13 @@ Ubuntu系统下您可以使用`cat /proc/cpuinfo | grep avx2`来检测您的处
 	* *CUDA 工具包8.0配合cuDNN v7*
 	* *GPU运算能力超过1.0的硬件设备*
 
+* 请确保您已经正确安装nccl2，或者按照以下指令安装nccl2（这里提供的是ubuntu 16.04，CUDA9，cuDNN7下nccl2的安装指令），更多版本的安装信息请参考NVIDIA[官方网站](https://developer.nvidia.com/nccl/nccl-download):
+
+ 
+  		wget https://developer.download.nvidia.com/compute/machine-learning/repos/ubuntu1604/x86_64/nvidia-machine-learning-repo-ubuntu1604_1.0.0-1_amd64.deb
+ 		dpkg -i nvidia-machine-learning-repo-ubuntu1604_1.0.0-1_amd64.deb`
+ 		sudo apt-get install -y libnccl2=2.3.7-1+cuda9.0 libnccl-dev=2.3.7-1+cuda9.0
+
 
 
 ## 选择如何安装
-- 
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