password not entered by any key.

[rajubhai ramvani]

>
> dear sir,

when i am using terminal "*sudo aptget clean" *the display asking sudo
password and when i am entering password the any key is not typing so dear
sir.help me.and i am not can update os because  error is coming "*sudo apt
-get install-f*" so what is this please help me.
rajuramvani.
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