Disable kernel lockdown on 18.04

Question

I am trying to access a device connected through USB3 (an intel realsense depth camera), however I believe the kernel lockdown is blocking access to it.

dkms status

reads the proper camera, but when I try to check if data is being streamed with

dmesg -wT

I get a long output which culminates in this error message:

 Lockdown: systemd-udevd: unsigned module loading is restricted; see man kernel_lockdown.7

How can I disable the kernel lockdown so that I can gain access to this device?

I have tried this as suggested by a few posts, but it has no effect:

echo 1 > /proc/sys/kernel/sysrq
echo x > /proc/sysrq-trigger

Solution

If you want to use 3rd party unsigned kernel modules, you need to disable Secure Boot in BIOS settings.

Comments

[figbar]

Ok, I will try that tomorrow. I have a windows and ubuntu dual boot. I have tried disabling safe boot and booting to windows before, but it ends up giving me blue screens and boot not found errors, so I turned it back on. I have not tried straight to ubuntu yet. Is there a way to do this so that I don't have to turn Secure Boot on and off every time I want to switch? (This may be outside the purview of this forum if it is a windows issue, but I would love your help if you know anything)

[Pilot6]

Windows should boot with Secure Boot off.

[figbar]

It didn't work until I disabled bitlocker for some reason

[Greg]

I'm frustrated by these workaround "answers" disabling secure boot. It feels like "I'm locked out of my home how do I get back in" - proposed solution "just throw a brick through the window". Yes it works, but you lose something else in the process. Better answers would include "how to self-sign your kernel modules" or "how to install 3rd party modules to be signed as part of dkms".

[Pilot6]

It is your choice, but my opinion is that Secure Boot is useless for security.