DisplayLink Won't Install on Ubuntu 17.10

[mlukaszek]

This looks like a successful installation, the information about FAQ is important to read though. Logs can be captured by Linux Support Tool: https://support.displaylink.com/know...to-displaylink

Regards,
Michal

[boltbeard]

Hi, I have exactly the same issue,
Do have a look at the attachments, I ran the DLSupport Tool and have attached the logs

[mlukaszek]

@boltbeard: your logs show you're running with:
[ 0.000000] Secure boot enabled and kernel locked down

As with any DKMS-built module, evdi, which is a part of the driver package cannot be run unsigned. You need to either sign the module yourself (harder), or disable secure boot in your BIOS settings.

Cheers,
Michal

[boltbeard]

@mlukaszek: I am not too happy with the option of disabling secure boot in the BIOS, I'll take the signing the module harder myself option.
Although I'm open to any option that helps me use the dock properly. I'm not that good a developer, but if your could point me to the guide/documentation of both the options I'll be happy to do this and see if it solves the problem,

if it does, it may solve a lot of other peoples problems too.

Thanks in advance and best regards

[rboerner]

DisplayLink has posted this information here -> https://support.displaylink.com/know...-with-uefi-sec

They have all their Ubuntu support information listed here -> https://support.displaylink.com/know...hooting-ubuntu

[boltbeard]

Originally Posted by rboerner

DisplayLink has posted this information here -> https://support.displaylink.com/know...-with-uefi-sec

They have all their Ubuntu support information listed here -> https://support.displaylink.com/know...hooting-ubuntu

I just had a look at the documentation, the following steps are provided:

Create signing keys

openssl req -new -x509 -newkey rsa:2048 -keyout MOK.priv -outform DER -out MOK.der -nodes -days 36500 -subj "/CN=Descriptive name/"

Sign the module

sudo /usr/src/linux-headers-$(uname -r)/scripts/sign-file sha256 ./MOK.priv ./MOK.der /path/to/module

Register the keys to Secure Boot

sudo mokutil --import MOK.der

Supply a password for later use after reboot

Reboot and follow instructions to Enroll MOK (Machine Owner Key). Here's a sample with pictures. The system will reboot one more time.

Question is what is the /path/to/module that I'm supposed to be signing? I've done the default install, I'm assuming there would be a default location?

[Balt]

So after a bit of poking around I discovered something in both Ubuntu 17.10 and Ubuntu Budgie 17.10. If you open 'Display' the external monitors don't show up. What I had to do was hit Fn+F8 on my laptop's keyboard (a Dell) to push the extend the display when connected to the dock. Once I did that one monitor came to life and the second monitor was still dark but both showed up in 'displays'. A little tweaking there and hitting 'Apply' made both external displays work. Weird that they weren't automatically extended to (like every other OS we use). Oh well. Hope this helps some folks.