So, when you are in the console and use sudo for the first time, it will ask you for your password, which you probably have experienced. If I understand your issue correctly, when you type your password, nothing happens, right? Now, is it that when you type a key, nothing shows up or is it when you input your WHOLE password and hit enter, nothing happens? I ask because when using sudo and typing in your password for the first time....as you type in your password, nothing that you type in will show up...that is normal. Once you correctly type in your password and then hit enter, you should see the terminal accept your password and then you will be in superuser or root mode. Hope that makes sense.

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