i get this error while trying out the exercise from the (Describe Azure compute and networking services) "Create a Linux virtual machine and install Nginx"
az vm create \
--resource-group learn-60170c16-3498-49ac-b16b-69e2316c2391 \
--name my-vm \
--public-ip-sku Standard \
--image Ubuntu2204 \
--admin-username azureuser \
--generate-ssh-keys
{"status":"Failed","error":{"code":"DeploymentFailed","target":"/subscriptions/6a102217-8579-4a7b-a135-4ed6f44db887/resourceGroups/learn-60170c16-3498-49ac-b16b-69e2316c2391/providers/Microsoft.Resources/deployments/vm_deploy_Bo2xMjNcfqgRahUmRLPY485GNmhVaa4C","message":"At least one resource deployment operation failed. Please list deployment operations for details. Please see https://aka.ms/arm-deployment-operations for usage details.","details":[{"code":"PropertyChangeNotAllowed","target":"imageReference","message":"Changing property 'imageReference' is not allowed."}]}}