Please tell me how to get root access on Ubuntu ? How to get administrator rights, please tell me.
just use " su" get root access 
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I can not reset your password or create a new user, a default password ?
what image are you used ???,please let me know.
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Use sudo su - or use sudo -s and your normal user account’s password. If that does not work, then you chose a crappy OS image.
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Thank you very much, I figured out it was a bad image. I overwrite all works now.