24 votesGathering Feedback · 9 comments · DisplayLink Feature Suggestions · Flag idea as inappropriate… · Admin →Lord Booth commented
>> modprobe: modprobe: ERROR: could not insert 'evdi': Required key not available
Nearly the same error message as above, but substantially the same. I do not believe this is an error from DisplayLink. In my case, it was because of my default BIOS security settings.
My UEFI Bios Secure boot setting was active. I believe it was preventing all third party drivers, DisplayLink included, from installing.
From here: https://askubuntu.com/questions/762254/why-do-i-get-required-key-not-available-when-install-3rd-party-kernel-modules (The post by Pilot6)
It shows two ways to disable it. For my Ubuntu 16.04 LTS, I used:
sudo apt install mokutil
sudo mokutil --disable-validation
It will ask you to set up a password of at least 8 chars. Write it down. When you reboot it will ask for random chars within that password string.. char 2, char 7, etc. You will then be able to disable secure boot.
Everything came up fine after this.