Update: add debug msg

download.py

@@ -29,5 +29,11 @@ def download_NLTK():
 
 
 def download_demo():
+    os.system('echo "================ before clone demo ========================"')
+    os.system('ls -l /home/user')
+    os.system('echo "================ before clone demo ========================"')
     os.system(
         'mkdir /home/user/data && cd /home/user/data && git clone https://github.com/Kit-Hung/demos && cp /home/user/data/demos/blob/main/k8s/1-deploy/3-k8s_install/2-kubeadm/kubeadm.md /home/user/data')
+    os.system('echo "================ after clone nltk ========================"')
+    os.system('ls -l /home/user && ls -l /home/user/data && ls -l /home/user/data/demos')
+    os.system('echo "================ after clone nltk ========================"')