执行`cd ~/Homestead && vagrant up`开启虚拟机出现以下错误 ``` 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. ... ``` 进入你的BIOS，然后将virtualization（CPU虚拟化）设置为enable即可 BIOS界面：Configuratio > Intel Virtual Technology > Enabled