You need to update the ISO VBoxGuestAdditions either:
install / update the package using:
sudo apt-get install virtualbox-guest-additions-iso
or by downloading an ISO file from this download page .
Example for macOS:
sudo wget -O /Applications/VirtualBox.app/Contents/MacOS/VBoxGuestAdditions.iso http://download.virtualbox.org/virtualbox/5.0.10/VBoxGuestAdditions_5.0.10.iso
where the version of VBoxGuestAdditions ( 5.0.10 ) should match the installed VirtualBox binaries.
See: How to upgrade VirtualBox Guest Add-ons?
Consider also updating your VM window with:
vagrant box update
For Linux Ubuntu, also check this page: Configuring VirtualBox Guest Add-ons .
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