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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.

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marked as duplicate by fossfreedom Dec 13 '12 at 21:58

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

    
So, is your Num Lock on? –  Tom Brossman Dec 13 '12 at 18:51
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1 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...

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