Current setup: **Virtualbox 5.1.20** with **Vagrant 1.9.3**

Previous working setup: **Virtualbox 5.1.18** with **Vagrant 1.9.3**

I installed the latest version of Virtualbox and tried to start my VM. The folder mounting has stopped working. The same folder mounting works fine in **Virtualbox 5.1.18**. I get the following error message:

&gt; Vagrant was unable to mount VirtualBox shared folders. This is usually because the filesystem &quot;vboxsf&quot; is not available. This filesystem is made available via the VirtualBox Guest Additions and kernel module. Please verify that these guest additions are properly installed in the guest. This is not a bug in Vagrant and is usually caused by a faulty Vagrant box. For context, the command attempted was:
 
&gt;      mount -t vboxsf -o uid=1000,gid=1000 keys /keys 

&gt; The error output from the command was:

&gt;     mount: wrong fs type, bad option, bad superblock on keys,
    missing codepage or helper program, or other error
    In some cases useful info is found in syslog - try dmesg | tail or so.

I have tried manually installing `vagrant-vbguest` plugin (via `vagrant plugin install vagrant-vbguest`), but that fixed nothing. Downgrading back to 5.1.18 does resolve it, but this isn&#39;t ideal moving forward.

How can I get folder mounting working with **Virtualbox 5.1.20** and **Vagrant 1.9.3**?

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Vagrant was unable to mount VirtualBox shared folders