On 2018-05-04, Vagrant Cascadian wrote:
> Many of the icons appear to be missing from the user interface, such as
> the button for "Power on", "Pause the virtual machine", "Shut down the
> virtual machine" and "Show virtual hardware details".
>
> Also, selecting the "Show virtual hardware details" nearly all the icons
> are missing (e.g. "Overview", "Performance",
> "CPUs", "Memory", etc.).

Attached patch that fixes the issue by adding adwaita-icon-theme and
hicolor-icon-theme to propagated-inputs.

live well,
  vagrant