=== modified file 'apt/cache.py'
--- old/apt/cache.py	2011-11-22 17:06:30 +0000
+++ new/apt/cache.py	2012-03-28 08:10:51 +0000
@@ -152,8 +152,7 @@
         self._sorted_set = None
         self._weakref.clear()
 
-        self._have_multi_arch = bool(apt_pkg.config.value_list("APT::" +
-                                                               "Architectures"))
+        self._have_multi_arch = len(apt_pkg.get_architectures()) > 1
 
         progress.op = _("Building data structures")
         i = last = 0