diff --git a/charm-packages/ha_proxy_charm_vnf/ha_proxy_charm_vnfd.yaml b/charm-packages/ha_proxy_charm_vnf/ha_proxy_charm_vnfd.yaml
index a4842b3f58c2abfb1bdc67dd97dd96aa7985044f..8a85ba10e5664ac3dcb653a3a4a82f052a2c9b68 100644
--- a/charm-packages/ha_proxy_charm_vnf/ha_proxy_charm_vnfd.yaml
+++ b/charm-packages/ha_proxy_charm_vnf/ha_proxy_charm_vnfd.yaml
@@ -71,7 +71,7 @@ vnfd:
     vim-type: aws
   - id: ubuntu16.04-azure
     name: ubuntu16.04-azure
-    image: Canonical:UbuntuServer:16.04-LTS:latest
+    image: Canonical:UbuntuServer:16.04-LTS:16.04.202103160
     vim-type: azure
   vdu:
   - cloud-init-file: cloud-config.txt
diff --git a/charm-packages/k8s_proxy_charm_vnf/k8s_proxy_charm_vnfd.yaml b/charm-packages/k8s_proxy_charm_vnf/k8s_proxy_charm_vnfd.yaml
index 6a7744ddc87788894233cc773498150d6bc2cd93..9fcbf6d6e8f2fd6822d5fbbe37424edb8a61b61d 100644
--- a/charm-packages/k8s_proxy_charm_vnf/k8s_proxy_charm_vnfd.yaml
+++ b/charm-packages/k8s_proxy_charm_vnf/k8s_proxy_charm_vnfd.yaml
@@ -67,7 +67,7 @@ vnfd:
     name: ubuntu18.04
   - id: ubuntu18.04-azure
     name: ubuntu18.04-azure
-    image: Canonical:UbuntuServer:18.04-LTS:latest
+    image: Canonical:UbuntuServer:18.04-LTS:18.04.202103151
     vim-type: azure
   vdu:
   - cloud-init-file: cloud-config.txt
diff --git a/charm-packages/native_charm_vnf/native_charm_vnfd.yaml b/charm-packages/native_charm_vnf/native_charm_vnfd.yaml
index a4ab31243beb167d14e027aa4e9780c33e4a401e..8c958e8cc4ad742c01556a762a4d7b949f4016c1 100644
--- a/charm-packages/native_charm_vnf/native_charm_vnfd.yaml
+++ b/charm-packages/native_charm_vnf/native_charm_vnfd.yaml
@@ -57,7 +57,7 @@ vnfd:
     name: ubuntu18.04
   - id: ubuntu18.04-azure
     name: ubuntu18.04-azure
-    image: Canonical:UbuntuServer:18.04-LTS:latest
+    image: Canonical:UbuntuServer:18.04-LTS:18.04.202103151
     vim-type: azure
   vdu:
   - cloud-init-file: cloud-config.txt
diff --git a/charm-packages/nopasswd_k8s_proxy_charm_vnf/nopasswd_k8s_proxy_charm_vnfd.yaml b/charm-packages/nopasswd_k8s_proxy_charm_vnf/nopasswd_k8s_proxy_charm_vnfd.yaml
index 60d15147c1b73f22d7a8890f31f5c0fee5ed3983..128bbbfc459957a9995a59d162353e8c53c1efaa 100644
--- a/charm-packages/nopasswd_k8s_proxy_charm_vnf/nopasswd_k8s_proxy_charm_vnfd.yaml
+++ b/charm-packages/nopasswd_k8s_proxy_charm_vnf/nopasswd_k8s_proxy_charm_vnfd.yaml
@@ -65,7 +65,7 @@ vnfd:
     name: ubuntu18.04
   - id: ubuntu18.04-azure
     name: ubuntu18.04-azure
-    image: Canonical:UbuntuServer:18.04-LTS:latest
+    image: Canonical:UbuntuServer:18.04-LTS:18.04.202103151
     vim-type: azure
   vdu:
   - cloud-init-file: cloud-config.txt
diff --git a/charm-packages/nopasswd_proxy_charm_vnf/nopasswd_proxy_charm_vnfd.yaml b/charm-packages/nopasswd_proxy_charm_vnf/nopasswd_proxy_charm_vnfd.yaml
index 2308d5d14d6174647d08c304ba9604550b661d3a..131d1af4b1e459bac196af02815e38172948d17f 100644
--- a/charm-packages/nopasswd_proxy_charm_vnf/nopasswd_proxy_charm_vnfd.yaml
+++ b/charm-packages/nopasswd_proxy_charm_vnf/nopasswd_proxy_charm_vnfd.yaml
@@ -68,7 +68,7 @@ vnfd:
     vim-type: aws
   - id: ubuntu16.04-azure
     name: ubuntu16.04-azure
-    image: Canonical:UbuntuServer:16.04-LTS:latest
+    image: Canonical:UbuntuServer:16.04-LTS:16.04.202103160
     vim-type: azure
   vdu:
   - cloud-init-file: cloud-config.txt
diff --git a/charm-packages/ns_relations_provides_vnf/ns_relations_provides_vnfd.yaml b/charm-packages/ns_relations_provides_vnf/ns_relations_provides_vnfd.yaml
index 8d672d1cd7785257a74addf2b287b195d677f715..2bcc3f6876e1b7e3f5791ca6b01da894726e66af 100644
--- a/charm-packages/ns_relations_provides_vnf/ns_relations_provides_vnfd.yaml
+++ b/charm-packages/ns_relations_provides_vnf/ns_relations_provides_vnfd.yaml
@@ -53,7 +53,7 @@ vnfd:
     name: ubuntu18.04
   - id: ubuntu18.04-azure
     name: ubuntu18.04-azure
-    image: Canonical:UbuntuServer:18.04-LTS:latest
+    image: Canonical:UbuntuServer:18.04-LTS:18.04.202103151
     vim-type: azure
   vdu:
   - cloud-init-file: cloud-config.txt
diff --git a/charm-packages/ns_relations_requires_vnf/ns_relations_requires_vnfd.yaml b/charm-packages/ns_relations_requires_vnf/ns_relations_requires_vnfd.yaml
index 7be7a88f2ff9d2a2bec3f4e89f6b27ffa0a39976..8f19f30098f0fdcae0b4d3b5af6574e35e26c9b5 100644
--- a/charm-packages/ns_relations_requires_vnf/ns_relations_requires_vnfd.yaml
+++ b/charm-packages/ns_relations_requires_vnf/ns_relations_requires_vnfd.yaml
@@ -53,7 +53,7 @@ vnfd:
     name: ubuntu18.04
   - id: ubuntu18.04-azure
     name: ubuntu18.04-azure
-    image: Canonical:UbuntuServer:18.04-LTS:latest
+    image: Canonical:UbuntuServer:18.04-LTS:18.04.202103151
     vim-type: azure
   vdu:
   - cloud-init-file: cloud-config.txt
diff --git a/charm-packages/vnf_relations_vnf/vnf_relations_vnfd.yaml b/charm-packages/vnf_relations_vnf/vnf_relations_vnfd.yaml
index 572c8c913c324028d1b664eb88c727e515b2ee08..be361ef02c678211ebef452b82750262ec9d0565 100644
--- a/charm-packages/vnf_relations_vnf/vnf_relations_vnfd.yaml
+++ b/charm-packages/vnf_relations_vnf/vnf_relations_vnfd.yaml
@@ -96,7 +96,7 @@ vnfd:
     name: ubuntu18.04
   - id: ubuntu18.04-azure
     name: ubuntu18.04-azure
-    image: Canonical:UbuntuServer:18.04-LTS:latest
+    image: Canonical:UbuntuServer:18.04-LTS:18.04.202103151
     vim-type: azure
   vdu:
   - cloud-init-file: cloud-config.txt
diff --git a/epa_quota_vnf/epa_quota_vnfd.yaml b/epa_quota_vnf/epa_quota_vnfd.yaml
index 6f2414789939713324618b1087168259bc6487a3..34ce5161441b53d64611aa3e2c89544198054cf4 100644
--- a/epa_quota_vnf/epa_quota_vnfd.yaml
+++ b/epa_quota_vnf/epa_quota_vnfd.yaml
@@ -28,7 +28,7 @@ vnfd:
     vim-type: aws
   - id: ubuntu16.04-azure
     name: ubuntu16.04-azure
-    image: Canonical:UbuntuServer:16.04-LTS:latest
+    image: Canonical:UbuntuServer:16.04-LTS:16.04.202103160
     vim-type: azure
   vdu:
   - id: epa_quota-VM
diff --git a/hackfest_basic_metrics_vnf/hackfest_basic_metrics_vnfd.yaml b/hackfest_basic_metrics_vnf/hackfest_basic_metrics_vnfd.yaml
index 4ca223e4778c350b1cfd19c17a557096c6d3b6d5..11ba1891ee270f93c3c5202f51c2c029671f6f76 100644
--- a/hackfest_basic_metrics_vnf/hackfest_basic_metrics_vnfd.yaml
+++ b/hackfest_basic_metrics_vnf/hackfest_basic_metrics_vnfd.yaml
@@ -51,7 +51,7 @@ vnfd:
     vim-type: aws
   - id: ubuntu16.04-azure
     name: ubuntu16.04-azure
-    image: Canonical:UbuntuServer:16.04-LTS:latest
+    image: Canonical:UbuntuServer:16.04-LTS:16.04.202103160
     vim-type: azure
   vdu:
   - cloud-init-file: cloud-config
diff --git a/hackfest_basic_sriov_vnf/hackfest_basic_sriov_vnfd.yaml b/hackfest_basic_sriov_vnf/hackfest_basic_sriov_vnfd.yaml
index d8874bf5143470c36dc342b30798fc00c34a54b1..6d953e033f8be030e8aecd466b3dc2b03310f63d 100644
--- a/hackfest_basic_sriov_vnf/hackfest_basic_sriov_vnfd.yaml
+++ b/hackfest_basic_sriov_vnf/hackfest_basic_sriov_vnfd.yaml
@@ -28,7 +28,7 @@ vnfd:
     name: ubuntu18.04
   - id: ubuntu18.04-azure
     name: ubuntu18.04-azure
-    image: Canonical:UbuntuServer:18.04-LTS:latest
+    image: Canonical:UbuntuServer:18.04-LTS:18.04.202103151
     vim-type: azure
   vdu:
   - cloud-init-file: cloud.config
diff --git a/hackfest_basic_vnf/hackfest_basic_vnfd.yaml b/hackfest_basic_vnf/hackfest_basic_vnfd.yaml
index 0b5df3613ce072632391a4c32192ba5531c31755..6ae2805cfa0ec13c518eccadf2742a4eccba9c53 100644
--- a/hackfest_basic_vnf/hackfest_basic_vnfd.yaml
+++ b/hackfest_basic_vnf/hackfest_basic_vnfd.yaml
@@ -28,7 +28,7 @@ vnfd:
     vim-type: aws
   - id: ubuntu16.04-azure
     name: ubuntu16.04-azure
-    image: Canonical:UbuntuServer:16.04-LTS:latest
+    image: Canonical:UbuntuServer:16.04-LTS:16.04.202103160
     vim-type: azure
   vdu:
   - id: hackfest_basic-VM
diff --git a/hackfest_cloudinit_vnf/hackfest_cloudinit_vnfd.yaml b/hackfest_cloudinit_vnf/hackfest_cloudinit_vnfd.yaml
index 3b787e20fc9e26a5fa8697d158a9ccf695094d42..3d757c7e22b85b8d0228ba0ad7f6ff690bf0697a 100644
--- a/hackfest_cloudinit_vnf/hackfest_cloudinit_vnfd.yaml
+++ b/hackfest_cloudinit_vnf/hackfest_cloudinit_vnfd.yaml
@@ -39,7 +39,7 @@ vnfd:
     vim-type: aws
   - id: ubuntu16.04-azure
     name: ubuntu16.04-azure
-    image: Canonical:UbuntuServer:16.04-LTS:latest
+    image: Canonical:UbuntuServer:16.04-LTS:16.04.202103160
     vim-type: azure
   vdu:
   - cloud-init-file: cloud-config.txt
diff --git a/hackfest_multivdu_vnf/hackfest_multivdu_vnfd.yaml b/hackfest_multivdu_vnf/hackfest_multivdu_vnfd.yaml
index b09cf1874bfaed9e7e319544f742045906660867..fd762284c15eca4b29b217be577dbbae7b7dfe67 100644
--- a/hackfest_multivdu_vnf/hackfest_multivdu_vnfd.yaml
+++ b/hackfest_multivdu_vnf/hackfest_multivdu_vnfd.yaml
@@ -38,7 +38,7 @@ vnfd:
     vim-type: aws
   - id: ubuntu16.04-azure
     name: ubuntu16.04-azure
-    image: Canonical:UbuntuServer:16.04-LTS:latest
+    image: Canonical:UbuntuServer:16.04-LTS:16.04.202103160
     vim-type: azure
   vdu:
   - id: mgmtVM
diff --git a/nscharm_policy_vnf/nscharm_policy_vnfd.yaml b/nscharm_policy_vnf/nscharm_policy_vnfd.yaml
index a16198615331909243d14a8519d7f85a25fca7ab..4249f19345c0f55277ae24d8bfb3ad74a97fd9f7 100644
--- a/nscharm_policy_vnf/nscharm_policy_vnfd.yaml
+++ b/nscharm_policy_vnf/nscharm_policy_vnfd.yaml
@@ -50,7 +50,7 @@ vnfd:
     vim-type: aws
   - id: ubuntu16.04-azure
     name: ubuntu16.04-azure
-    image: Canonical:UbuntuServer:16.04-LTS:latest
+    image: Canonical:UbuntuServer:16.04-LTS:16.04.202103160
     vim-type: azure
   vdu:
   - cloud-init-file: cloud-config.txt
diff --git a/nscharm_user_vnf/nscharm_user_vnfd.yaml b/nscharm_user_vnf/nscharm_user_vnfd.yaml
index f8cdccce7b5e7fa51e258865204d66c37eecc225..c1d1bf3f486a09739379e52cfd194a38b63618e4 100644
--- a/nscharm_user_vnf/nscharm_user_vnfd.yaml
+++ b/nscharm_user_vnf/nscharm_user_vnfd.yaml
@@ -50,7 +50,7 @@ vnfd:
     vim-type: aws
   - id: ubuntu16.04-azure
     name: ubuntu16.04-azure
-    image: Canonical:UbuntuServer:16.04-LTS:latest
+    image: Canonical:UbuntuServer:16.04-LTS:16.04.202103160
     vim-type: azure
   vdu:
   - cloud-init-file: cloud-config.txt
diff --git a/ubuntu_cloudinit_vnf/ubuntu_cloudinit_vnfd.yaml b/ubuntu_cloudinit_vnf/ubuntu_cloudinit_vnfd.yaml
index 9b291ff0b38a009c2722cfc9023445b0c736c517..abc05f9a0f850f940e7d3ed5177ff3e0d664870a 100644
--- a/ubuntu_cloudinit_vnf/ubuntu_cloudinit_vnfd.yaml
+++ b/ubuntu_cloudinit_vnf/ubuntu_cloudinit_vnfd.yaml
@@ -29,7 +29,7 @@ vnfd:
     vim-type: aws
   - id: ubuntu16.04-azure
     name: ubuntu16.04-azure
-    image: Canonical:UbuntuServer:16.04-LTS:latest
+    image: Canonical:UbuntuServer:16.04-LTS:16.04.202103160
     vim-type: azure
   vdu:
   - cloud-init-file: cloud-init.cfg