The StopVm method in concierge/service.cc returns an error state if the named VM does not exist. This happens concierge does not have the named VM in its list of VMs because the VM has never been started or has already been stopped.

We have to check the failure reason here

https://cs.chromium.org/chromium/src/chrome/browser/chromeos/crostini/crostini_manager.cc?l=673

because we want the uninstall process to continue even if the VM is not currently running. It would be better to have this condition return success than to have to discriminate on failure reason.