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Basically, I have the seem problem as described here, only with Ubuntu 18.04 (thus no lightdm or sddm which could be restarted):

I am using a Dell laptop with a dell docking station, connected via USB 3. Three external displays are connected (thus I cannot get rid of the NVidia driver) and I get graphical glitches in a rectangular (probably square, hard to say) area around the mouse cursor.

Since logging in doesn't work when the laptop is connected to the docking station anyway, I always connect it after logging in, unplugging the USB 3 cable and plugging it in again doesn't change anything.

Anyone got an idea what could at least be a workaround for Ubuntu 18.04?

Florian Schaetz
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1 Answers1

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I had same problem on 18.04, but already installed lightdm before (dont remember why). You can install it as described here. Then you can restart lightdm with

sudo service lightdm restart

Also if you dont want to install lightdm, you can try to reboot, it helped me once, but next power-on glitch appeared again.

Dmitry
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