Unable to update fedora

[apparatus]

Do you upgrade your Whonix templates using Qubes Update tool or by manually running the update commands in the template terminal?

Maybe you have the same issue as here:

Only Fedora-based templates (and **not** Debian- or Arch-based ones) updateable

Ha! Found it. I needed an apt-get dist-upgrade rather than plain apt-get upgrade! Following that, whonix-gateway-17 keeps working as expected!