This looks very dangerous. You add untrusted repository and then install software which can be tampered with.

$ sudo add-apt-repository ppa:teejee2008/ppa
$ sudo apt-get install ukuu

Disable access control with the following command:

$ sudo xhost +
$ sudo ukuu
$ sudo ukuu --install-latest
$ sudo reboot

James, thanks for the post on this because I had to do the exact same thing to fix mine.

I got the same error as yours when I tried installing. I would also like to add that this fixed my driver issues with Ryzen and I now have 1920 x1080 resolution. xandr kept failing when I was trying to manually add my resolution.

Updating the kernel is actually what fixed all of my resolution issues. I am using the Ryzen 2200 GPU for anyone interested in fixing the same issue (I was getting the “failed to get size of gamma for output” when using –newmode for xrandr).

Here is exactly what I ran to get this to work (I am pretty sure these links are only for AMD so if you have intel you have to go to the website and select the ones for your system https://kernel.ubuntu.com/~kernel-ppa/mainline/v4.19/.

It seems the article is missing the modules install (You need the Linux headers, Linux image unsigned, and the modules file). This article actually has you install the headers twice which isn’t right. I would still like to say thank you to the person who wrote this blog and many others, it has helped me out more than you could imagine.

$ wget https://kernel.ubuntu.com/~kernel-ppa/mainline/v4.20/linux-headers-4.20.0-042000-generic_4.20.0-042000.201812232030_amd64.deb
$ wget https://kernel.ubuntu.com/~kernel-ppa/mainline/v4.20/linux-image-unsigned-4.20.0-042000-generic_4.20.0-042000.201812232030_amd64.deb
$ wget https://kernel.ubuntu.com/~kernel-ppa/mainline/v4.20/linux-modules-4.20.0-042000-generic_4.20.0-042000.201812232030_amd64.deb
$ sudo dpkg -i *.deb
$ reboot

Hopefully this helps someone else out! Enjoy!!!
Josh