diff --git a/ubuntu-14.04/http/preseed-lvm.cfg b/ubuntu-14.04/http/preseed-lvm.cfg
index 528a577..d5bc29f 100644
--- a/ubuntu-14.04/http/preseed-lvm.cfg
+++ b/ubuntu-14.04/http/preseed-lvm.cfg
@@ -36,9 +36,9 @@
                       options/noatime{ noatime }              \
               .                                               \
               128 512 200% linux-swap                         \
-                      method{ swap } format{ }                \
+                      method{ swap } format{ } $lvmok{ }      \
               .                                               \
-              512 512 512 ext4                                \
+              512 512 -1 ext4                                 \
                       method{ format } format{ } $lvmok{ }    \
                       use_filesystem{ } filesystem{ ext4 }    \
                       mountpoint{ / }                         \
diff --git a/ubuntu-14.04/template.json b/ubuntu-14.04/template.json
index 1677300..bfc4e8f 100644
--- a/ubuntu-14.04/template.json
+++ b/ubuntu-14.04/template.json
@@ -91,7 +91,8 @@
     {
       "type": "docker-tag",
       "repository": "cloudlab/ubuntu",
-      "tag": "14.04"
+      "tag": "14.04",
+      "only": ["docker"]
     }
   ],
   "builders": [