When using the alternative user with the command su , we can not open graphics applications. For example, if I am logged in as a user to assist him and I want to start a GUI application under my account, I get the error can not open display:: 0.0
I can solve this problem either with xhost , which allows me to report authorized users to access the X server for my session with either sux which is a known extended to the graphical session.
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