GTK-warning **: cannot open display: 0.0 Solution

GTK-warning **: cannot open display: 0.0 Solution

When Su is used to runProgramWhen the program needs to display images, the following prompt may appear:

Root @ DT :~ # Sudo-I-u Keji Google-chrome
No Protocol specified

(Google-chrome: 5146): GTK-warning **: cannot open display: 0.0

This is because xserver does not allow other users' graphics to be displayed on the current screen by default. if you want other users' images to be displayed on the current screen, run the following command as the current login user, that is, the user before switching the identity.

Xhost +

By executing this command, other users are authorized to access the current screen, so they can run the program to be run as another user.