I can't type. My keyboard blocks when the password is required in bash.

Hello

When I try to access the root when the bash asks for password I can only type the username. My keyboard just doesn't works. The same happened in my other computer when I tried to login in Metasploitable through the VM Virtual Box.

Username: ok
Password:

(Keyboard blocks and I can't type anymore.

I can't pass beyond this step.

Someone knows how can I fix it?

Thanks.