diff --git a/focal-fossa-jdk8-devel/descriptor.json b/focal-fossa-jdk8-devel/descriptor.json
index 9dc63f1..e6df6ce 100644
--- a/focal-fossa-jdk8-devel/descriptor.json
+++ b/focal-fossa-jdk8-devel/descriptor.json
@@ -20,5 +20,5 @@
     "email":"m.lettere@gmail.com"
   },
   "type":"lxd",
-  "image":"ubuntu:20.04"
+  "image":"focal-fossa-jdk8-devel"
 }
diff --git a/focal-fossa-py3-devel/descriptor.json b/focal-fossa-py3-devel/descriptor.json
index 04fb68f..897751a 100644
--- a/focal-fossa-py3-devel/descriptor.json
+++ b/focal-fossa-py3-devel/descriptor.json
@@ -18,5 +18,5 @@
     "email":"m.lettere@gmail.com"
   },
   "type":"lxd",
-  "image":"ubuntu:20.04"
+  "image":"focal-fossa-py3-devel"
 }
diff --git a/focal-fossa/descriptor.json b/focal-fossa/descriptor.json
index 5e3c21e..02b042a 100644
--- a/focal-fossa/descriptor.json
+++ b/focal-fossa/descriptor.json
@@ -15,5 +15,5 @@
     "email":"m.lettere@gmail.com"
   },
   "type":"lxd",
-  "image":"ubuntu:20.04"
+  "image":"focal-fossa"
 }