After upgrading from 16.04 to 18.04 I can't find a way to use the nvidia-settings either via command line or GUI.

When I run sudo nvidia-settings I got the following message :

No protocol specified
Unable to init server: Impossible de se connecter : Connexion refusée

ERROR: The control display is undefined; please run `nvidia-settings --help`
       for usage information.

ubuntu-drivers devices produces :

== /sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0 ==
modalias : pci:v000010DEd00001C8Dsv000017AAsd000039D1bc03sc02i00
vendor   : NVIDIA Corporation
model    : GP107M [GeForce GTX 1050 Mobile]
driver   : nvidia-driver-396 - third-party free recommended
driver   : nvidia-driver-390 - third-party free
driver   : xserver-xorg-video-nouveau - distro free builtin

The command prime-select query outputs : nvidia

First I tried to install the drivers with :

sudo add-apt-repository ppa:graphics-drivers/ppa
sudo apt install nvidia-driver-396

Then I tried

sudo apt purge nvidia*
sudo apt update
sudo apt upgrade
sudo ubuntu-drivers autoinstall

but no changes

I remember that in 16.04 I used a proprietary driver. But now there is no proprietary driver that I can select : software and updates

Let me know if any additional infos or command output could help to solve the issue.

I also have ukuu (ubuntu kernel update utility) and have the kernel up to date with the last version.

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