linuxVM-ssh-invalid Key

[linuxVM-ssh-invalid Key

### Issue Details
Error: Error applying plan:

1 error(s) occurred:

* azurerm_virtual_machine.demoterraformvm: 1 error(s) occurred:

* azurerm_virtual_machine.demoterraformvm: compute.VirtualMachinesClient#CreateOrUpdate: Failure responding to request: StatusCode=400 -- Original Error: autorest/azure: Service returned an error. Status=400 Code="InvalidParameter" Message="The value of parameter linuxConfiguration.ssh.publicKeys.keyData is invalid."

Terraform does not automatically rollback in the face of errors.
Instead, your Terraform state file has been partially updated with
any resources that successfully completed. Please address the error
above and apply again to incrementally change your infrastructure.

No file or test is named. Start at the azurerm_virtual_machine.demoterraformvm create/update entry point and inspect the linuxConfiguration.ssh.publicKeys.keyData value reported by Azure; done means the plan applies without the InvalidParameter error.

Written by the indexing model from the issue text.