Visually indicate unsupported StandaloneVMs (incl. TemplateVMs) in Qubes Manager

[andrewdavidwong]

@adrelanos wrote:

Perhaps QVMM could show and visually(!) mark template packages as obsolete? This visual mark should be removable after the user upgraded. Perhaps a dom0 one time popup with a reminder? Using /etc/qubes/post-install.d/ mechanism?

That would hint users at having to upgrade.

This is a great idea. Users shouldn't have to rely on seeing an announcement from me in order to know that they have to update something. The more of this external communication we can integrate into Qubes in a secure way, the more robust and self-sufficient the system will be.

(This doesn't mean we'll stop publishing announcements the way we currently do. We'd probably continue our current announcements to provide out-of-band verification and for those who want to be notified via email, RSS, or social media on non-Qubes devices.)

Related issue: https://github.com/QubesOS/qubes-issues/issues/3430