diff --git a/pattern-1/bosh-release/jobs/nfs_server/templates/ctl.erb b/pattern-1/bosh-release/jobs/nfs_server/templates/ctl.erb
index ce49a8c..b6c9b25 100644
--- a/pattern-1/bosh-release/jobs/nfs_server/templates/ctl.erb
+++ b/pattern-1/bosh-release/jobs/nfs_server/templates/ctl.erb
@@ -51,7 +51,7 @@ log_debug "Kicking off ctl script as `whoami` with $1"
 dpkg -s nfs-kernel-server >/dev/null 2>&1
 if [ $? -ne 0 ] ; then
   apt-get update
-  apt-get install nfs-kernel-server
+  apt-get install nfs-kernel-server -y
 fi
 
 # create the share directory and set permission
diff --git a/pattern-1/bosh-release/jobs/wso2is/templates/ctl.erb b/pattern-1/bosh-release/jobs/wso2is/templates/ctl.erb
index 3826273..7d04a74 100644
--- a/pattern-1/bosh-release/jobs/wso2is/templates/ctl.erb
+++ b/pattern-1/bosh-release/jobs/wso2is/templates/ctl.erb
@@ -65,7 +65,7 @@ dpkg -s nfs-common >/dev/null 2>&1
 if [ $? -ne 0 ] ; then
   log_debug "Installing NFS Client"
   sudo apt-get update
-  sudo apt-get install nfs-common
+  sudo apt-get install nfs-common -y
 fi
 
 mkdir -p ${NFS_SHARE_SERVER_DIR}
diff --git a/pattern-1/tile/tile.yml b/pattern-1/tile/tile.yml
index 0cf184e..cb419e9 100644
--- a/pattern-1/tile/tile.yml
+++ b/pattern-1/tile/tile.yml
@@ -28,9 +28,9 @@ label: WSO2 Identity Server 5.7.0 - Pattern 1
 description: PCF Tile for WSO2 Identity Server 5.7.0
 
 stemcell_criteria:
-  os: ubuntu-trusty
+  os: ubuntu-xenial
   requires_cpi: false
-  version: '3541'
+  version: '170.15'
 
 forms:
 - name: bps_ds
diff --git a/pattern-2/bosh-release/jobs/wso2is/templates/ctl.erb b/pattern-2/bosh-release/jobs/wso2is/templates/ctl.erb
index cad2da4..7a31ea7 100644
--- a/pattern-2/bosh-release/jobs/wso2is/templates/ctl.erb
+++ b/pattern-2/bosh-release/jobs/wso2is/templates/ctl.erb
@@ -67,7 +67,7 @@ dpkg -s nfs-common >/dev/null 2>&1
 if [ $? -ne 0 ] ; then
   log_debug "Installing NFS Client"
   sudo apt-get update
-  sudo apt-get install nfs-common
+  sudo apt-get install nfs-common -y
 fi
 
 mkdir -p ${NFS_SHARE_SERVER_DIR}
diff --git a/pattern-2/tile/tile.yml b/pattern-2/tile/tile.yml
index e1d6878..4aef76c 100644
--- a/pattern-2/tile/tile.yml
+++ b/pattern-2/tile/tile.yml
@@ -28,9 +28,9 @@ label: WSO2 Identity Server 5.7.0 - Pattern 2
 description: PCF Tile for WSO2 Identity Server 5.7.0 - Pattern 2
 
 stemcell_criteria:
-  os: ubuntu-trusty
+  os: ubuntu-xenial
   requires_cpi: false
-  version: '3541'
+  version: '170.15'
 
 forms:
 - name: bps_ds