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You have not told us which distro and version of Linux you are using. You have not told us what you did before facing this problem. Did you install something? Did you change some settings? Did you try some new command? Did you run some code or scripts? Update your question with written description of the problem including precise information about what you did before. Just pictures are not enough.
code
or scripts? Update your question with written description of the problem including precise information about what you did before. Just pictures are not enough.