I know my administrative and account password. But, whenever I try to change it or do anything like connecting to wifi, connecting to a new internet connection whether it be wired or a mobile network, or anything work, my Ubuntu 12.04 ( Which I have been using since 2012) is showing this message for a few days, I will be highly grateful if someone tells me how to solve this , I deadly need to connect wifi at least. 
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programking
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