XenAPI: run DomU on a virtual kernel

Fixes bug 1154506.

Change-Id: I6e2f576a6de19db70f2a88278f9c043a433f4cec
diff --git a/tools/xen/devstackubuntupreseed.cfg b/tools/xen/devstackubuntupreseed.cfg
index d8caaee..c559b1e 100644
--- a/tools/xen/devstackubuntupreseed.cfg
+++ b/tools/xen/devstackubuntupreseed.cfg
@@ -257,7 +257,7 @@
 
 # The kernel image (meta) package to be installed; "none" can be used if no
 # kernel is to be installed.
-#d-i base-installer/kernel/image string linux-generic
+d-i base-installer/kernel/image string linux-virtual
 
 ### Account setup
 # Skip creation of a root account (normal user account will be able to