diff --git a/overlord/ifacestate/helpers.go b/overlord/ifacestate/helpers.go
index c20a83e1c..bf4625939 100644
--- a/overlord/ifacestate/helpers.go
+++ b/overlord/ifacestate/helpers.go
@@ -300,6 +300,18 @@ func (m *InterfaceManager) autoConnect(task *state.Task, snapName string, blackl
 			continue
 		}
 		candidates := m.repo.AutoConnectCandidateSlots(snapName, plug.Name, autochecker.check)
+		// If we are in a core transition we may have both the old ubuntu-core
+		// snap and the new core snap providing the same interface. In that
+		// situation we want to ignore any candidates in ubuntu-core and simply
+		// go with those from the new core snap.
+		if len(candidates) == 2 {
+			switch {
+			case candidates[0].Snap.Name() == "ubuntu-core" && candidates[1].Snap.Name() == "core":
+				candidates = candidates[1:2]
+			case candidates[1].Snap.Name() == "ubuntu-core" && candidates[0].Snap.Name() == "core":
+				candidates = candidates[0:1]
+			}
+		}
 		if len(candidates) != 1 {
 			continue
 		}