I am unable to log into my Ubuntu 12.04 machine, username and password prompts reapper again. I can only log in as a guest.
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You can try this:
Press Ctrl+Alt+F1, then login into the system. If your password is correct, you will succeed. Then run
rm .Xauthority .ICEauthority
Press Ctrl+Alt+F7 and try to login again.

Pilot6
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Thanks for your reply, it says incorrect login. Please clarify thanks – May 10 '15 at 08:50
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If you entered login and password, not mixing them up, it means that your password is incorrect. – Pilot6 May 10 '15 at 08:58
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It is correct, i don't understand what is the issue here. Please help, i do not want to lose valuable date on my laptop! thanks – May 10 '15 at 09:01
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If you can't login to system console, it means that login/password are incorrect. I can't guess why it happened. You won't lose your data, because you can always boot from LiveCD and copy the data anywhere you choose. – Pilot6 May 10 '15 at 09:03
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user login appears, but the password does not appear once typed, is that normal? – May 10 '15 at 09:09
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Yes, it is normal. – Pilot6 May 10 '15 at 09:12
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Check for capslock, language, etc. – Pilot6 May 10 '15 at 09:13
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i am very sure both log in and password are correct, any other alternatives? its getting frustrating – May 10 '15 at 09:29
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But the system is sure they are not correct. There may be many reasons for that. You probably entered some wrong command, etc. As I said, you can boot frome external drive and extract your data. – Pilot6 May 10 '15 at 09:33
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Fine, i am new to Ubuntu I'd appreciate if you could help me through the steps of extracting my data rather than wasting time on fixing this issue. Thanks – May 10 '15 at 09:41
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Or you can recover the password. http://askubuntu.com/questions/24006/how-do-i-reset-a-lost-administrative-password – Pilot6 May 10 '15 at 09:45