How to Solve Incorrect Password ...Try Again Error in Ubuntu

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If you're getting an error that says "Incorrect Password " when running software in Ubuntu, it's usually because the root account is disabled by default. We'll show you how to enable the root user in Ubuntu to resolve the incorrect password error.

Method 1
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    To enable your root account, you need to type following command to the Terminal (press Ctrl+Alt+T on your keyboard) or use copy/paste method: sudo passwd root (then hit Enter)
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    The password is that one, which you're using in the Login Screen. Password does not show up in the terminal when you type it. Just type your password and hit Enter. You will maybe prompt to enter user password for twice, so do that. If your password was entered correctly, the action will continue.
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    To do that, you need to type following command to the Terminal to run LightDM: sudo gedit /etc/lightdm/lightdm.conf (then hit Enter)
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    greeter-show-manual-login=true (then save it and close LightDM).
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    Now it will works. If you will want to disable your root account, then you need to type following command to the Terminal (press Ctrl+Alt+T on your keyboard) or use copy/paste method: sudo passwd -l root (then hit Enter)
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