Yugang Wang

It is possible that users might forget to install the [prerequisites](https://github.com/Azure/azure-cli/blob/dev/doc/install_linux_prerequisites.md)

Create a Kernel Keyring Token Cache (Linux only)

1

When Linux Desktop is unavailable, in a nutshell, that dbus is missing, we should use kernel keyring e.g. generate a symmetric encryption key, save it into [key-ring](http://man7.org/linux/man-pages/man7/keyrings.7.html), and use it...