Update build-image-with-packer.md

Ubuntu image isn't valid.

Author: doommius

articles/virtual-machines/linux/build-image-with-packer.md

@@ -87,9 +87,9 @@ Create a file named *ubuntu.json* and paste the following content. Enter your ow
     "managed_image_name": "myPackerImage",
 
     "os_type": "Linux",
-    "image_publisher": "Canonical",
-    "image_offer": "UbuntuServer",
-    "image_sku": "20.04-LTS",
+    "image_publisher": "canonical",
+    "image_offer": "0001-com-ubuntu-server-jammy",
+    "image_sku": "22_04-lts",
 
     "azure_tags": {
         "dept": "Engineering",
@@ -127,9 +127,9 @@ source "azure-arm" "autogenerated_1" {
   }
   client_id                         = "f5b6a5cf-fbdf-4a9f-b3b8-3c2cd00225a4"
   client_secret                     = "0e760437-bf34-4aad-9f8d-870be799c55d"
-  image_offer                       = "UbuntuServer"
-  image_publisher                   = "Canonical"
-  image_sku                         = "20.04-LTS"
+  image_offer                       = "0001-com-ubuntu-server-jammy"
+  image_publisher                   = "canonical"
+  image_sku                         = "22_04-lts"
   location                          = "East US"
   managed_image_name                = "myPackerImage"
   managed_image_resource_group_name = "myResourceGroup"
@@ -151,7 +151,7 @@ build {
 }
 ```
 
-This template builds an Ubuntu 20.04 LTS image, installs NGINX, then deprovisions the VM.
+This template builds an Ubuntu 22.04 LTS image, installs NGINX, then deprovisions the VM.
 
 > [!NOTE]
 > If you expand on this template to provision user credentials, adjust the provisioner command that deprovisions the Azure agent to read `-deprovision` rather than `deprovision+user`.