--- ./base/univention-updater/python/univention-repository-create.orig	2018-11-14 15:56:59.446220332 +0100
+++ ./base/univention-updater/python/univention-repository-create	2018-11-15 10:23:24.174253283 +0100
@@ -66,18 +66,23 @@
             print >> sys.stderr, 'Aborted.'
             sys.exit(1)
 
-    # install univention-debmirror
-    print 'Installing univention-debmirror'
-    ret = subprocess.call(['univention-install', '--yes', 'univention-debmirror'])
-    if ret != 0:
-        print >> sys.stderr, 'Error: Failed to install univention-debmirror'
-        sys.exit(1)
-
+    # check whether univention-debmirror is installed and install it if needed
     ret, msg = urepo.is_debmirror_installed()
     if not ret:
         print >> sys.stderr, msg
         sys.exit(1)
 
+    if ret != True:
+        print 'Installing univention-debmirror'
+        ret = subprocess.call(['univention-install', '--yes', 'univention-debmirror'])
+        if ret != 0:
+            print >> sys.stderr, 'Error: Failed to install univention-debmirror'
+            sys.exit(1)
+        ret, msg = urepo.is_debmirror_installed()
+        if not ret:
+            print >> sys.stderr, msg
+            sys.exit(1)
+
 
 def prepare(options):
     """ Set local/repository and create directory structure """