diff --git a/README.md b/README.md
index 311d0d6843..4a1151dbf8 100644
--- a/README.md
+++ b/README.md
@@ -16,7 +16,7 @@ Milvus is the world's fastest similarity search engine for massive-scale feature
 
 For more detailed introduction of Milvus and its architecture, see [Milvus overview](https://www.milvus.io/docs/en/aboutmilvus/overview/).
 
-Milvus provides stable [Python](https://github.com/milvus-io/pymilvus), [Java](https://github.com/milvus-io/milvus-sdk-java) and C++ APIs. 
+Milvus provides stable [Python](https://github.com/milvus-io/pymilvus), [Java](https://github.com/milvus-io/milvus-sdk-java) and [C++](https://github.com/milvus-io/milvus/tree/master/core/src/sdk) APIs. 
 
 Keep up-to-date with newest releases and latest updates by reading Milvus [release notes](https://www.milvus.io/docs/en/release/v0.5.0/).
 
diff --git a/README_CN.md b/README_CN.md
index 5dad64af9b..8f4d4b05aa 100644
--- a/README_CN.md
+++ b/README_CN.md
@@ -20,7 +20,7 @@
 
 Milvus 是一款开源的、针对海量特征向量的相似性搜索引擎。基于异构众核计算框架设计，成本更低，性能更好。在有限的计算资源下，十亿向量搜索仅毫秒响应。
 
-Milvus 提供稳定的 Python、Java 以及 C++ 的 API 接口。
+Milvus 提供稳定的 [Python](https://github.com/milvus-io/pymilvus)、[Java](https://github.com/milvus-io/milvus-sdk-java) 以及 [C++](https://github.com/milvus-io/milvus/tree/master/core/src/sdk) 的 API 接口。
 
 通过 [版本发布说明](https://milvus.io/docs/zh-CN/release/v0.5.0/) 获取最新发行版本的 Milvus。
 
diff --git a/core/ubuntu_build_deps.sh b/core/ubuntu_build_deps.sh
index 911046aa1f..6f3fabc084 100755
--- a/core/ubuntu_build_deps.sh
+++ b/core/ubuntu_build_deps.sh
@@ -9,4 +9,6 @@ sudo apt-get -y update && sudo apt-get -y install intel-mkl-gnu-2019.5-281 intel
 sudo apt-get install -y gfortran libmysqlclient-dev mysql-client libcurl4-openssl-dev libboost-system-dev \
 libboost-filesystem-dev libboost-serialization-dev libboost-regex-dev
 
-sudo ln -s /usr/lib/x86_64-linux-gnu/libmysqlclient.so /usr/lib/x86_64-linux-gnu/libmysqlclient_r.so
+if [ ! -f "/usr/lib/x86_64-linux-gnu/libmysqlclient_r.so" ]; then
+    sudo ln -s /usr/lib/x86_64-linux-gnu/libmysqlclient.so /usr/lib/x86_64-linux-gnu/libmysqlclient_r.so
+fi