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Although I've set up a username and password when I was installing Ubuntu 13.04, when I type inmy password it says it's incorrect although language is checked and my password's correct. What's wrong?

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Your username and password are also case-sensitive. – karel Jun 9 '13 at 10:59
All lower case used still no result. – Ele Jun 9 '13 at 11:03

If You don't want to reinstall your os, then you can boot from a live CD an generate passwd hash, and replace the line in /etc/shadow

The structure of the file is: the second field is the password hash.

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