Quote Originally Posted by K-Man
I already know about that. The problem is when I try to change the password the command box freezes.
Are you sure it freezes. Did you try writing something and pressing Enter? It's normal that you don't see anything while typing your password - it's meant to work that way.

Code:
knoppix@1[knoppix]$ sudo passwd
Enter new UNIX password:          # Enter your password and press Enter, you won't see anything while typing.
Retype new UNIX password:         # Enter your password again and press Enter, you won't see anything while typing.
passwd: password updated successfully