The provider 'virtualbox' that was requested to back the machine
'homestead-7' is reporting that it isn't usable on this system. The
reason is shown below:

Vagrant has detected that you have a version of VirtualBox installed
that is not supported by this version of Vagrant. Please install one of
the supported versions listed below to use Vagrant:

4.0, 4.1, 4.2, 4.3, 5.0, 5.1, 5.2, 6.0

A Vagrant update may also be available that adds support for the version
you specified. Please check www.vagrantup.com/downloads.html to download
the latest version.

安装 VirtualBox 6.0 即可 目前最新版本 vagrant 2.2.6 

homestead-7 这个版本 是否该升级了