electron:837): Gtk-WARNING **: cannot open display: 0:

[yohu12]

And I can run startx to show the desktop screen on the monitor. only npm start is not work.

[sdetweil]

@yohu12 do it in two steps

export DISPLAY=:0
npm start

[yohu12]

@sdetweil said in electron:837): Gtk-WARNING **: cannot open display: 0::

export DISPLAY=:0

It return same error

(electron:1493): Gtk-WARNING **: cannot open display: :0

[sdetweil]

@yohu12 this is the same as MagicMirror/installers/mm.sh

Are u doing this over vpn?

Also the operating system must have xwindows running…

[__willo__]

I saw this error because the raspi was set to Autologin as “pi” and I had created another user which could not take control of the display.

[Corben Dallas]

I saw this just yesterday (followed by a few other warnings). Solution was to follow pretty much this ancient but still working how-to for jessie:
jessie-lite-installation-guide
(especially points describing “Install Xserver, LXDE-gui and lightdm” and missing packages)