vboxguest: module verification failed: signature and/or required key missing - tainting kernel

[FranzS]

Dear all,

If i look at my syyslog (using Ubuntu 16.04) i see things like this:

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May 14 12:00:03 fortuna kernel: [    7.962773] EXT4-fs (dm-0): re-mounted. Opts: errors=remount-ro
May 14 12:00:03 fortuna kernel: [    8.354372] vboxguest: module verification failed: signature and/or required key missing - tainting kernel
May 14 12:00:03 fortuna kernel: [    8.371889] piix4_smbus 0000:00:07.0: SMBus base address uninitialized - upgrade BIOS or use force_addr=0xaddr
May 14 12:00:03 fortuna kernel: [    8.397995] vgdrvHeartbeatInit: Setting up heartbeat to trigger every 2000 milliseconds
May 14 12:00:03 fortuna kernel: [    8.398075] input: Unspecified device as /devices/pci0000:00/0000:00:04.0/input/input6
May 14 12:00:03 fortuna kernel: [    8.410875] vboxguest: misc device minor 55, IRQ 20, I/O port d020, MMIO at 00000000f0400000 (size 0x400000)
May 14 12:00:03 fortuna kernel: [    8.410879] vboxguest: Successfully loaded version 5.0.20 (interface 0x00010004)
May 14 12:00:03 fortuna kernel: [    8.469950] [drm] Initialized drm 1.1.0 20060810

So on one hand an error, but on the other hand it works.
I've googled a little and found out that it has to do with Kernel Signatures.
Is there any way to fix this?

I've installed the guest Additions like this:

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sudo mount /dev/sr0 /media/cdrom/
sudo apt-get install -y dkms build-essential linux-headers-generic linux-headers-$(uname -r)
sudo /media/cdrom/VBoxLinuxAdditions.run

Is this the recommended way or shall i install a guest addition apt package?

[Perryg]

Sounds like the same issue as your other post viewtopic.php?f=3&t=77685
Is this a server or desktop?

[FranzS]

Hi,

not it is a different issue.
This one is about the Kernel Module them self and signing. (And a different Failure in my perspective)
It is Ubuntu 16.04 Server.

Regards
/Franz

[Perryg]

Very well.

[FranzS]

Nobody has a s similar issue or message in the boot log?

[Daniel.Glasser]

I also have the same message in syslog:

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vboxguest: module verification failed: signature and/or required key missing - tainting kernel

I get this with a Ubuntu 16.04 guest using, most recently, VirtualBox 5.1.

It seems as though the GuestAdditions installation is not signing, or is using the wrong key to sign, the kernel modules it builds.

Still, the module is loading, so I'm not dead in the water, but I'd rather it not be tainting the kernel when it doesn't have to be.