VBoxManage: error: Failed to create the host-only adapter

I've installed virtualbox version 5.1.20 and vagrant version 1.9.4 and then when I ran vagrant up, I got the following error

Command: ["hostonlyif", "create"]
Stderr: 0%...
Progress state: NS_ERROR_FAILURE
VBoxManage: error: Failed to create the host-only adapter
VBoxManage: error: VBoxNetAdpCtl: Error while adding new interface: VBoxNetAdpCtl: ioctl failed for /dev/vboxnetctl: Inappropriate ioctl for devic
VBoxManage: error: Details: code NS_ERROR_FAILURE (0x80004005), component HostNetworkInterfaceWrap, interface IHostNetworkInterface
VBoxManage: error: Context: "RTEXITCODE handleCreate(HandlerArg*)" at line 94 of file VBoxManageHostonly.cpp

I fount this answer here Could not load 'vboxdrv' after upgrade to Ubuntu 16.04 (and I want to keep secure boot) but when I get to the third step sudo mokutil --import MOK.der, I got the following error

EFI variables are not supported on this system

I'm running Ubuntu 16.04.

3 Answers

I have spent hours and hours, trying various combinations of virtualbox and vagrant, no luck.

Remove virtual box or any old versions of it.

sudo apt remove virtualbox virtualbox-5.0 virtualbox-4.*

Then try using one of ubuntu repositories to install

sudo apt-get install virtualbox

Worked for me.

1

Restarting network manager should help:

sudo modprobe vboxnetadp

2

I had the same problem and the apt remove install answer did not work for my (Ubuntu 16.04) I did get it to work by using sudo apt remove virtualbox virtualbox-5.0 virtualbox-4.* and then installing the 5.1 .deb file from virtualbox VirtualBox 5.1 downloads

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