I understand now about "on reboot, disable the secure boot through the
GUI". It came up after my entering "sudo apt install virtualbox". So I
selected Disable etc. The command finished OK as did "sudo apt install
virtualbox-dkms" though that didn't do anything as it must have been
installed by "sudo apt install virtualbox". However, on starting
VirtualBox again and doing "New" for Windows 7 32-bit, I still got the
same error i.e. a dialog box about vboxdrv. Any ideas?
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Could not load 'vboxdrv' after upgrade to Ubuntu 16.04
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