If the virtual machine does not have an nVidia GPU, Manjaro Settings Manager GUI or mhwd would not be able to install nVidia drivers
pacman-mirrors would confirm if the vm is using testing branch and mirrors are up to date
pamac info nvidia-utils to check version number is consistent with latest testing branch packages
Text from terminal commands should be posted as preformatted text using </> button in reply box or Ctrl+E on keyboard