diff --git a/ubuntu/env.md b/ubuntu/env.md
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+# env
+
+``` bash
+deb http://mirrors.cloud.aliyuncs.com/ubuntu/ xenial main
+deb-src http://mirrors.cloud.aliyuncs.com/ubuntu/ xenial main
+deb http://mirrors.cloud.aliyuncs.com/ubuntu/ xenial-updates main
+deb-src http://mirrors.cloud.aliyuncs.com/ubuntu/ xenial-updates main
+
+deb http://mirrors.cloud.aliyuncs.com/ubuntu/ xenial universe
+deb-src http://mirrors.cloud.aliyuncs.com/ubuntu/ xenial universe
+deb http://mirrors.cloud.aliyuncs.com/ubuntu/ xenial-updates universe
+deb-src http://mirrors.cloud.aliyuncs.com/ubuntu/ xenial-updates universe
+deb http://mirrors.cloud.aliyuncs.com/ubuntu/ xenial-security main
+deb-src http://mirrors.cloud.aliyuncs.com/ubuntu/ xenial-security main
+deb http://mirrors.cloud.aliyuncs.com/ubuntu/ xenial-security universe
+deb-src http://mirrors.cloud.aliyuncs.com/ubuntu/ xenial-security universe
+
+```
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