启动提示下面的异常：

Timed out while waiting for the machine to boot. This means that
Vagrant was unable to communicate with the guest machine within
the configured ("config.vm.boot_timeout" value) time period.If you look above, you should be able to see the error(s) that
Vagrant had when attempting to connect to the machine. These errors
are usually good hints as to what may be wrong.If you're using a custom box, make sure that networking is properly
working and you're able to connect to the machine. It is a common
problem that networking isn't setup properly in these boxes.
Verify that authentication configurations are also setup properly,
as well.If the box appears to be booting properly, you may want to increase
the timeout ("config.vm.boot_timeout") value.

使用的virtualbox的版本是VirtualBox-6.0.10-132072-Win.exe

vagrant版本是VirtualBox-6.0.10-132072-Win.msi。执行vagrant up时报上面的异常，尝试网上很多方法不奏效，后面将VirtualBox-6.0.10卸载，安装VirtualBox-6.0.10(vagrant不用换)，可正常启动，输入账号vagrant，密码输入vagrant登录成功：