I cant login in Ubuntu Server after passwd command [duplicate]

Question

Possible Duplicate:
Authentication token manipulation error

I installed Ubuntu Server using Oracle VM on my Windows 7 for practicing GNU commands.

I used the passwd tool but after using the command I am not able to login into my Ubuntu.

When I type my password nothing happens. Nothing gets written on the black screen. And when I press Enter it says _login incorrect_ And one more thing is says _hint: num lock on_

When I tried to change the password into recovery mode it says:

_Authentication token manipulation error_

I reinstalled my virtual machine but the problem persist.

Answer 1

The password not showing is normal on a non-graphical login.

You can test that the keyboard types what you think it types by typing your password in as the login name.

Try searching for Authentication token manipulation error...