diff --git a/.env.example b/.env.example
index 53db7ce..8db7984 100644
--- a/.env.example
+++ b/.env.example
@@ -74,8 +74,6 @@ COMPOSE_CONVERT_WINDOWS_PATHS=1
 
 # If you need to change the sources (i.e. to China), set CHANGE_SOURCE to true
 CHANGE_SOURCE=false
-# Set CHANGE_SOURCE and UBUNTU_SOURCE option if you want to change the Ubuntu system sources.list file.
-UBUNTU_SOURCE=aliyun
 # Set ORACLE INSTANT_CLIENT_MIRROR option if you want to use Intranet improve download, you can download files first
 ORACLE_INSTANT_CLIENT_MIRROR=https://github.com/diogomascarenha/oracle-instantclient/raw/master/
 
diff --git a/README-zh.md b/README-zh.md
index e519ef1..d05a7db 100644
--- a/README-zh.md
+++ b/README-zh.md
@@ -78,8 +78,6 @@ cp .env.example .env
 ```
 # 开启ubuntu国内源
 CHANGE_SOURCE=true
-# 默认是阿里云，可选项有aliyun|zju|tsinghua|163|ustc
-UBUNTU_SOURCE=aliyun
 # composer镜像源
 WORKSPACE_COMPOSER_REPO_PACKAGIST=https://mirrors.aliyun.com/composer/
 # nvm镜像源