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I removed my password from the user menu where they gave the option for no password. So i pressed that and now the computer can be logged into but they ask a password which is not my old password....What should i do? I am quite new to Ubuntu....

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This is a bug described here and here, where setting the no password login also removes the password therefore using sudo etc. is impossible. The link given by @Rohit is essential to re-create your lost password. If you can still login however, you can open up the terminal; usually CTRL+ALT+T and type passwd to change your password.

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passwd assumes you want to change your own password if you don't specify any arguments. – psusi Jun 15 '12 at 1:33
Right, It's just that I'm used to run passwd with root. Hence the username. I'll update my answer. – Rey Leonard Amorato Jun 15 '12 at 12:26

Follow the below link to resolve your issueHow to reset your password or this with new OS

I personally suggest to have password, even if small but strong and secret

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