Qubes upgrade dom0
To launch a dom0 terminal, click the Qubes App Launcher (blue/grey "Q") and then open the Terminal Emulator (Xfce Terminal).
Upgrade Qubes dom0. This step is mandatory. 
- This is required to make sure a recent version of Qubes repository definition files, Qubes salt, qubes-core-admin-addon-whonix [archive] as well as qubes-mgmt-salt-dom0-virtual-machines [archive] gets installed.