似乎每次醒来，启动Homestead，它都会出各种各样的妖蛾子。这 次，我去，Homestead共享失效了。
在启动vagrant up时它似乎提醒我 Virtualbox Guest Additions ISO版本不配套的问题，我将VBOX从5.1.2升级到5.2.8后这个附件应该没有更新。这会影响共享。
当时没有搭理它，vagrant ssh进入~提示符。当我从windows charm浏览器访问：laravel.test我的WEB主机时，问题来了：
网页总是提示 "No input file specified"，看上去web服务器工作了，但是它找不到文件，一查，共享失效，windows的网页文件，在虚拟主机中看不到了。
习惯性的，我打开GUI的VBOX，点devices最下面的 add 。。。总是不管用。总是提示Unmount，卷标挂不上。
网上找了一大圈，偶然发现个小命令管用了：
E:Homestead>vagrant plugin install vagrant-vbguest
上面这一步一开始走不动， timeout了，我估计是从国外下载什么东西，中国墙住了，后来启动翻墙工具，算是装上了：
Installing the 'vagrant-vbguest' plugin. This can take a few minutes...
Fetching: micromachine-2.0.0.gem (100%)
Fetching: vagrant-vbguest-0.15.1.gem (100%)
Installed the plugin 'vagrant-vbguest (0.15.1)'!
安装这个插件，可能是用来装附件的吧。下一步，reload一下：
E:Homestead>vagrant reload
如果你对这段唠叨又不重要的英文没兴趣，请翻几页跳过
==> homestead-7: Checking if box 'laravel/homestead' is up to date...
==> homestead-7: Clearing any previously set forwarded ports...
==> homestead-7: Clearing any previously set network interfaces...
==> homestead-7: Preparing network interfaces based on configuration...
homestead-7: Adapter 1: nat
homestead-7: Adapter 2: hostonly
==> homestead-7: Forwarding ports...
homestead-7: 80 (guest) => 8000 (host) (adapter 1)
homestead-7: 443 (guest) => 44300 (host) (adapter 1)
homestead-7: 3306 (guest) => 33060 (host) (adapter 1)
homestead-7: 4040 (guest) => 4040 (host) (adapter 1)
homestead-7: 5432 (guest) => 54320 (host) (adapter 1)
homestead-7: 8025 (guest) => 8025 (host) (adapter 1)
homestead-7: 27017 (guest) => 27017 (host) (adapter 1)
homestead-7: 80 (guest) => 8080 (host) (adapter 1)
homestead-7: 22 (guest) => 2222 (host) (adapter 1)
==> homestead-7: Running 'pre-boot' VM customizations...
==> homestead-7: Booting VM...
==> homestead-7: Waiting for machine to boot. This may take a few minutes...
homestead-7: SSH address: 127.0.0.1:2222
homestead-7: SSH username: vagrant
homestead-7: SSH auth method: private key
homestead-7: Warning: Connection reset. Retrying...
homestead-7: Warning: Connection aborted. Retrying...
homestead-7: Warning: Connection reset. Retrying...
homestead-7: Warning: Connection aborted. Retrying...
==> homestead-7: Machine booted and ready!
Got different reports about installed GuestAdditions version:
Virtualbox on your host claims: 5.0.18
VBoxService inside the vm claims: 5.2.4
Going on, assuming VBoxService is correct...
[homestead-7] GuestAdditions versions on your host (5.2.8) and guest (5.2.4) do not match.
Got different reports about installed GuestAdditions version:
Virtualbox on your host claims: 5.0.18
VBoxService inside the vm claims: 5.2.4
Going on, assuming VBoxService is correct...
Reading package lists...
Building dependency tree...
Reading state information...
dkms is already the newest version (2.2.0.3-2ubuntu11.5).
linux-headers-4.4.0-116-generic set to manually installed.
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
Copy iso file D:Program FilesOracleVirtualBoxVBoxGuestAdditions.iso into the box /tmp/VBoxGuestAdditions.iso
Mounting Virtualbox Guest Additions ISO to: /mnt
mount: /dev/loop0 is write-protected, mounting read-only
Installing Virtualbox Guest Additions 5.2.8 - guest version is 5.2.4
Verifying archive integrity... All good.
Uncompressing VirtualBox 5.2.8 Guest Additions for Linux........
VirtualBox Guest Additions installer
Removing installed version 5.2.4 of VirtualBox Guest Additions...
Copying additional installer modules ...
Installing additional modules ...
VirtualBox Guest Additions: Building the VirtualBox Guest Additions kernel modules.
VirtualBox Guest Additions: Running kernel modules will not be replaced until the system is restarted
VirtualBox Guest Additions: Starting.
An error occurred during installation of VirtualBox Guest Additions 5.2.8. Some functionality may not work as intended.
In most cases it is OK that the "Window System drivers" installation failed.
Job for vboxadd-service.service failed because the control process exited with error code. See "systemctl status vboxadd-service.service" and "journalctl -xe" for details.
Unmounting Virtualbox Guest Additions ISO from: /mnt
Got different reports about installed GuestAdditions version:
Virtualbox on your host claims: 5.0.18
VBoxService inside the vm claims: 5.2.8
Going on, assuming VBoxService is correct...
Got different reports about installed GuestAdditions version:
Virtualbox on your host claims: 5.0.18
VBoxService inside the vm claims: 5.2.8
Going on, assuming VBoxService is correct...
==> homestead-7: Checking for guest additions in VM...
homestead-7: The guest additions on this VM do not match the installed version of
homestead-7: VirtualBox! In most cases this is fine, but in rare cases it can
homestead-7: prevent things such as shared folders from working properly. If you see
homestead-7: shared folder errors, please make sure the guest additions within the
homestead-7: virtual machine match the version of VirtualBox you have installed on
homestead-7: your host and reload your VM.
homestead-7:
homestead-7: Guest Additions Version: 5.0.18_Ubuntu r106667
homestead-7: VirtualBox Version: 5.2
==> homestead-7: Setting hostname...
==> homestead-7: Configuring and enabling network interfaces...
==> homestead-7: Mounting shared folders...
homestead-7: /vagrant => E:/Homestead
homestead-7: /home/vagrant/code => E:/code
==> homestead-7: Machine already provisioned. Run `vagrant provision` or use the `--provision`
==> homestead-7: flag to force provisioning. Provisioners marked to run always will still run.
重要的是它管用了，现在先不必用vagrant ssh进入，在网页上测试一下，虚拟主机，哈,it work.