What is the "qt.qpa.screen: QXcbConnection: Could not connect to display :0" error and how to fix?

Question

linux

$ sudo wireshark
[sudo] пароль для dvr: 
No protocol specified
qt.qpa.screen: QXcbConnection: Could not connect to display :0
Could not connect to any X display.

but if run without sudo, then wireshark starts

Answer 1

The problem arises from the control of user rights. Use sudo -E or specialized utilities to run graphical applications as root. We recommend that you read more at the links:
https://losst.ru/oshibka-cannot-open-display-linux
https://www.reddit.com/r/wireshark/comments/feamxg...

Answer 2

It can also work from the user, you just need to red-eye a little .