I tried installing Virtualbox in Ubuntu 16.04 with the command
sudo apt install virtualbox-5.1 but it gives the following error.
$ virtualbox WARNING: The vboxdrv kernel module is not loaded. Either there is no module available for the current kernel (4.4.0-171-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. VirtualBox: Error -610 in supR3HardenedMainInitRuntime! VirtualBox: dlopen("/usr/lib/virtualbox/VBoxRT.so",) failed: <NULL> VirtualBox: Tip! It may help to reinstall VirtualBox.
I tried solving the error from multiple sites but still no avail.