Ubuntu: deploy new AMI to eu-central-1 region

Disable unattended-upgrades service

Signed-off-by: Arthur She <arthur.she@linaro.org>
Change-Id: I0615607a53870da4007a2c626d8ef870075ac3b4
diff --git a/packer_ubuntu.json b/packer_ubuntu.json
index 43c09ba..e5eefe2 100644
--- a/packer_ubuntu.json
+++ b/packer_ubuntu.json
@@ -1,6 +1,6 @@
 {
   "variables": {
-    "vpc_region": "us-east-1",
+    "vpc_region": "eu-central-1",
     "ssh_username": "ubuntu"
   },
   "builders": [