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I'm using Ubuntu 13.10 64bit. In the "System Settings"->"User Accounts" I chose the "Login without a password". This was my only administrator account, so according to this answer, I encountered bug #1168749, meaning I can't authenticate, not in the terminal and not in the GUI. I tried all of these answers:

After the first two I was again able to authenticate in the GUI, but still can't sudo in the terminal after trying all these answers and solutions.. Anyone knows how to fix this bug?

edit

Actually I was wrong, I can sudo (silly mistake, my bad). I just kept trying to enter su and it said:

su: Authentication failure
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david-hoze
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  • What exactly happens when you try to use sudo in the terminal? Please edit your question adding any error messages exactly as they are printed. – steeldriver Jul 14 '14 at 12:03
  • Actually I was wrong, I can sudo, but when I press su it says: su: Authentication failure with the same password. – david-hoze Jul 14 '14 at 15:21

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The behaviour you're describing is normal, because the root account is locked by default in Ubuntu. If you need an interactive root shell you should use sudo -i instead of su

For further information, see the discussion at RootSudo

steeldriver
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