My problem already listed in the forum but unfortunately it is closed and no satisfying answer available in that post. So, I am opening a new thread.

I am using ubuntu 13.04. I changed my password using passwd command for the user. Ex: Suppose 'XYZ' is the username I am using to login. I used this command to change the password of that user:

sudo passwd XYZ

It prompted me to enter my current password and later new password twice. everything is fine. But after changing user password successfully, I log-out and tried to log-in. I failed.

After entering my password and pressing enter, it simply goes blank for 1 or 2 seconds and re-appears the log-in screen. I am unable to enter. At the time of installation I used "encryption of home folder" option. So, I am unable to access my data from windows. (As you know that We can have read access of linux partition using some softwares).

Please help and thanks in advance.