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I'm using Ubuntu 13.04 and trying to enter this command sudo add-apt-repository ppa:cairo-dock-team/ppa, but then it asks for my password and I can't type anything. The only thing I can do is press enter, and then it says incorrect password. Please help!

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    When you type in your password in Terminal, nothing shows up. So type in your password and press Enter to continue. – SimplySimon Aug 19 '13 at 16:03
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If you entered this command in the terminal, you just enter your password. It won't indicate that it receives anything but validates it when you press RETURN

If you have graphical UI you can use gksudo instead and it will prompt you for password in a more graphical manner. Try this:

gksudo add-apt-repository ppa:cairo-dock-team/ppa

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