diff -r e83de6c409fd -r 7e9c9a32f24f misc/migration/postcreate.py
--- a/misc/migration/postcreate.py	Tue Sep 15 18:30:05 2015 +0200
+++ b/misc/migration/postcreate.py	Tue Sep 15 18:39:09 2015 +0200
@@ -18,12 +18,14 @@
 """cubicweb post creation script, set user's workflow"""
 from __future__ import print_function
 
+from six import text_type
+
 # insert versions
 create_entity('CWProperty', pkey=u'system.version.cubicweb',
-              value=unicode(config.cubicweb_version()))
+              value=text_type(config.cubicweb_version()))
 for cube in config.cubes():
     create_entity('CWProperty', pkey=u'system.version.%s' % cube.lower(),
-                  value=unicode(config.cube_version(cube)))
+                  value=text_type(config.cube_version(cube)))
 
 # some entities have been added before schema entities, fix the 'is' and
 # 'is_instance_of' relations
@@ -51,7 +53,7 @@
         print('Hopefully this is not a production instance...')
     elif anonlogin:
         from cubicweb.server import create_user
-        create_user(session, unicode(anonlogin), anonpwd, u'guests')
+        create_user(session, text_type(anonlogin), anonpwd, u'guests')
 
 # need this since we already have at least one user in the database (the default admin)
 for user in rql('Any X WHERE X is CWUser').entities():