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I am trying to install gfortran from a shell/terminal, I write sudo apt-get install gfortran and then in the next line appears sudo password from romulo. But when I try to write the password the letters of the password does not appear in the shell, I can't write any letter. This occurs when I try to install any program. What can I do?

marked as duplicate by psusi, Seth, kiri, Avinash Raj, Jorge Castro Dec 16 '13 at 15:56

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When you enter your password at a sudo prompt, no letters or other symbols appear. Type your password correctly, hit enter, and everything should work fine.

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