Ubuntu: (wireshark:1642): Gtk-WARNING **: cannot open display: localhost:11.0


I want to open GUI applications on browser. I followed all the steps mentioned online on this page https://github.com/dreamsxin/example/blob/master/gtk/Broadway.md and tried to find solution as well but I failed.

Whenever I run an application it gives me "Gtk-WARNING **: cannot open display: localhost:11.0 this error"

Can anyone please help me? Please


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