Logging in the New Created User Ubuntu12.04 lts

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http://askubuntu.com – I just created an account with name rashmi and set its password. Then I restarted my system. When I log in to rashmi another screen appears for less than a second and then vanish and again the login screen comes back. So I am not able to login in to Ubuntu from the newly created user I created my user with sudo useradd rashmi, then set its password using sudo passwd rashmi. Can anyone please tell me how to log in as a new user and where I am going wrong? (HowTos)