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When I try to upgrade, I am prompted for authentication password. I enter the password I have set, but I receive a message saying it is incorrect. The same thing happens when I am prompted to "unlock" for document editing, etc. The password is rejected.

I re-set my password in the root system, but continue to have the same problem.

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    "I re-set my password in the root system" the authentication password should be your main user password. root is disabled by default. that being said, how did you do this? – wxl Sep 6 '14 at 2:25
  • What happens if you try "ubuntu" as your password? – Chan-Ho Suh Sep 6 '14 at 2:27
  • What commands did you used to change password in terminal ? Give more details. su passwd.... – A Umar Mukthar Sep 6 '14 at 2:30
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It could be an issue with the keyboard language as I discovered. When I input my initial password, the keyboard is ENG (GB), but once the OS loads, the keyboard changes to US keyboard layout. This means that certain special keys (such as " and @) are switched around.

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