diff --git a/.hub/jupyter_config_backup.py b/.hub/jupyter_config_backup.py
index a909055..8ccf619 100644
--- a/.hub/jupyter_config_backup.py
+++ b/.hub/jupyter_config_backup.py
@@ -1,4 +1,4 @@
-import os, grp, shutil, subprocess, configparser
+import os, grp, pwd, shutil, subprocess, configparser
 from pathlib import Path
 from jupyterhub.spawner import Spawner
 
@@ -64,7 +64,8 @@ def prepare_user(spawner: Spawner):
 
     # 3. 取系统组
     try:
-        gid_list = os.getgrouplist(username, grp.getpwnam(username).pw_gid)
+        pwnam = pwd.getpwnam(username)
+        gid_list = os.getgrouplist(username, pwnam.pw_gid)
     except (KeyError, OSError):
         return
     user_groups = {grp.getgrgid(g).gr_name for g in gid_list}
diff --git a/.hub/readme.md b/.hub/readme.md
index 594ce4b..6f8823d 100644
--- a/.hub/readme.md
+++ b/.hub/readme.md
@@ -4,7 +4,7 @@
 1. **jupyter_config_backup.py** jupyterhub配置文件拷贝，使用时将此文件拷贝至host端相应路径后重启hub即可。
 
 ```shell
-sudo cp jupyter_config_backup.py /opt/tljh/config/jupyter_config.d/99-group-template.py
+sudo cp jupyter_config_backup.py /opt/tljh/config/jupyterhub_config.d/99-group-template.py
 ```
 
 相关的配置说明见文件内注释。