diff -Nru horizon-2012.1.3+stable~20120815-691dd2/debian/changelog horizon-2012.1.3+stable~20120815-691dd2/debian/changelog
--- horizon-2012.1.3+stable~20120815-691dd2/debian/changelog	2012-08-31 08:15:13.000000000 +0800
+++ horizon-2012.1.3+stable~20120815-691dd2/debian/changelog	2013-01-11 20:18:34.000000000 +0800
@@ -1,3 +1,10 @@
+horizon (2012.1.3+stable~20120815-691dd2-0ubuntu1.2) precise; urgency=low
+
+  * Fix deleted flavors which are used cann't be retrived and cause exception
+    issue (LP: #981269)  
+
+ -- Yaguang Tang (Yaguang) <yaguang.tang@canonical.com>  Fri, 11 Jan 2013 20:15:21 +0800
+
 horizon (2012.1.3+stable~20120815-691dd2-0ubuntu1.1) precise-security; urgency=low
 
   * SECURITY UPDATE: open redirect / phishing attack via "next"
diff -Nru horizon-2012.1.3+stable~20120815-691dd2/debian/patches/deleted-flavor-exception.patch horizon-2012.1.3+stable~20120815-691dd2/debian/patches/deleted-flavor-exception.patch
--- horizon-2012.1.3+stable~20120815-691dd2/debian/patches/deleted-flavor-exception.patch	1970-01-01 08:00:00.000000000 +0800
+++ horizon-2012.1.3+stable~20120815-691dd2/debian/patches/deleted-flavor-exception.patch	2013-01-11 20:20:17.000000000 +0800
@@ -0,0 +1,77 @@
+Description: Fix the issue that deleted flavor which is inuse cause exception.
+ Nova flavor-delete allows deletion of a given flavor, when there are running
+instances with this flavor. That causes horizon and other tools not to work 
+properly and throw errors for the running instances which flavor has been deleted.
+
+Author: Yaguang Tang (Yaguang) <yaguang.tang@canonical.com>
+Bug-Ubuntu: https://bugs.launchpad.net/bugs/981269
+
+--- horizon-2012.1.3+stable~20120815-691dd2.orig/horizon/dashboards/nova/instances_and_volumes/views.py
++++ horizon-2012.1.3+stable~20120815-691dd2/horizon/dashboards/nova/instances_and_volumes/views.py
+@@ -54,13 +54,27 @@ class IndexView(tables.MultiTableView):
+         if instances:
+             try:
+                 flavors = api.flavor_list(self.request)
+-                full_flavors = SortedDict([(str(flavor.id), flavor) for \
+-                                            flavor in flavors])
+-                for instance in instances:
+-                    instance.full_flavor = full_flavors[instance.flavor["id"]]
+             except:
+-                msg = _('Unable to retrieve instance size information.')
+-                exceptions.handle(self.request, msg)
++                # If fails to retrieve flavor list, creates an empty list.
++                flavors = []
++
++                full_flavors = SortedDict([(str(flavor.id), flavor)
++                                            for flavor in flavors])
++                for instance in instances:
++                    try:
++                        flavor_id = instance.flavor["id"]
++                        if flavor_id in full_flavors:
++                            instance.full_flavor = full_flavors[flavor_id]
++                        else:
++                            # If the flavor_id is not in full_flavors list,
++                            # gets it via nova api.
++                            instance.full_flavor = api.flavor_get(
++                                                    self.request, flavor_id)
++
++                    except:
++                        msg = _('Unable to retrieve instance size \
++                                information.')
++                        exceptions.handle(self.request, msg)
+         return instances
+ 
+     def get_volumes_data(self):
+--- horizon-2012.1.3+stable~20120815-691dd2.orig/horizon/dashboards/syspanel/instances/views.py
++++ horizon-2012.1.3+stable~20120815-691dd2/horizon/dashboards/syspanel/instances/views.py
+@@ -52,8 +52,6 @@ class AdminIndexView(tables.DataTableVie
+                 flavors = api.nova.flavor_list(self.request)
+             except:
+                 flavors = []
+-                msg = _('Unable to retrieve instance size information.')
+-                exceptions.handle(self.request, msg)
+             # Gather our tenants to correlate against IDs
+             try:
+                 tenants = api.keystone.tenant_list(self.request, admin=True)
+@@ -64,8 +62,18 @@ class AdminIndexView(tables.DataTableVie
+ 
+             full_flavors = SortedDict([(f.id, f) for f in flavors])
+             tenant_dict = SortedDict([(t.id, t) for t in tenants])
++            # Loop through instances to get flavor and tenant info.
+             for inst in instances:
+-                inst.full_flavor = full_flavors.get(inst.flavor["id"], None)
+-                tenant = tenant_dict.get(inst.tenant_id, None)
+-                inst.tenant_name = getattr(tenant, "name", None)
++                flavor_id = inst.flavor["id"]
++                try:
++                    if flavor_id in full_flavors:
++                        inst.full_flavor = full_flavors[flavor_id]
++                    else:
++                        # If the flavor_id is not in full_flavors list,
++                        # flavor may be a 'deleted', gets it via nova api.
++                        inst.full_flavor = api.nova.flavor_get(
++                                            self.request, flavor_id)
++                except:
++                    msg = _('Unable to retrieve instance size information.')
++                    exceptions.handle(self.request, msg)
+         return instances
diff -Nru horizon-2012.1.3+stable~20120815-691dd2/debian/patches/series horizon-2012.1.3+stable~20120815-691dd2/debian/patches/series
--- horizon-2012.1.3+stable~20120815-691dd2/debian/patches/series	2012-08-31 08:14:53.000000000 +0800
+++ horizon-2012.1.3+stable~20120815-691dd2/debian/patches/series	2013-01-11 20:19:31.000000000 +0800
@@ -7,3 +7,4 @@
 use-memcache.patch
 juju_panel-handle_catalog_exception.patch
 CVE-2012-3540.patch
+deleted-flavor-exception.patch