Why doesn't vagrant up work on ubuntu?

Question

virtual box

Hello! Installed vagrant and virtual box on Ubuntu. It's time to start...
1. I write:
vagrant up
To which I get this answer:

VirtualBox is complaining that the kernel module is not loaded. Please
run `VBoxManage --version` or open the VirtualBox GUI to see the error
message which should contain instructions on how to fix this error.

2.Next, naturally I write:
VBoxManage --version
To which I receive the following answer:

WARNING: The vboxdrv kernel module is not loaded. Either there is no module
         available for the current kernel (4.4.0-31-generic) or it failed to
         load. Please recompile the kernel module and install it by

           sudo /sbin/vboxconfig

         You will not be able to start VMs until this problem is fixed.
5.1.2r108956

3. I do what was written:
sudo /sbin/vboxconfig
On what, it turns out something like this:

vboxdrv.sh: Starting VirtualBox services.
vboxdrv.sh: Building VirtualBox kernel modules.
vboxdrv.sh: failed: modprobe vboxdrv failed. Please use 'dmesg' to find out why.

There were problems setting up VirtualBox.  To re-start the set-up process, run
  /sbin/vboxconfig
as root.

Please tell me what to do?