2014年3月10日 · A display is managed by a server program, known as an X server. The server serves displaying capabilities to other programs that connect to it. The remote server knows where it has to redirect the X network traffic via the definition of the DISPLAY environment variable which generally points to an X Display server located on your local computer.

2015年7月31日 · Of course, if you dont really need a display, you can launch a separate X11 server which displays into memory, and is completely independent of any user login and screen.

None of the xauth or xhost schemes allowed root to open the display in Debian 10 (Buster) or Ubuntu 20.04 from a terminal running root via "su" or an application launched using "sudo".

set DISPLAY and XAUTHORITY variable environment before running your scrip. for example in systemctl service file:

2013年12月27日 · If you certainly have run into this problem , type in the following commands: sudo apt-get update sudo apt-get upgrade sudo apt-get install fglrx sudo apt-get install xserver-xorg-core sudo apt-get install xserver-xorg sudo apt-get install xorg sudo apt-get install xorg openbox sudo apt-get install ubuntu-desktop

2015年12月26日 · Consider Xvfb which is probably least likely to mess up the display when you actually plug in a real monitor. The following commands will start lightdm on a fake display with ID 1 and resolution 1024x76. export DISPLAY=:1 Xvfb :1 -screen 0 1024x768x16 & sleep 1 #exec gnome-session & use gnome-session instead of lightdm exec lightdm-session &

X0 is a Unix socket that Xorg uses to communicate raw stream of bytes with the X clients (your graphical programs). This means that a single display called :0 is connected to the machine. (If the file was X3 this would mean that the display is called :3) So that's how you can know for sure what displays the display server is using.

2016年4月2日 · For other Ubuntu versions, first find which display manager your ubuntu is having with following command: cat /etc/X11/default-display-manager Than depending on what display manager, you can use one of the following commands: Default Ubuntu (with LightDM) sudo systemctl restart lightdm Gnome (with GDM) sudo systemctl restart gdm KDE (with KDM)

ssh -X user@machine env That should show all the environment. There should be various SSH things in there, and also DISPLAY. DISPLAY should be 10.0. You could also try this: ssh -X user@machine DISPLAY=10.0 xterm

2019年7月10日 · Only set the DISPLAY variable after you've ensured everything else is set up to work correctly. You shouldn't have to set this but it is possible. You shouldn't have to set this but it is possible. I believe that the command 'hangs forever' because it is being displayed on the remote machine (which you likely cannot see).