commit 055f16b01c3bfc71764e9dd06705ea63b3624bb9
Author: Frank <frank@dell.fritz.box>
Date:   Thu Sep 28 22:28:14 2017 +0200

    Fix for bug #1720209

diff --git a/share/ltsp-manager/signup.py b/share/ltsp-manager/signup.py
index fbb37ae..06bd02e 100755
--- a/share/ltsp-manager/signup.py
+++ b/share/ltsp-manager/signup.py
@@ -16,6 +16,7 @@ import socket
 import sys
 
 import iso843
+import common
 
 class Connection:
     def __init__(self, host, port):