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12.04 home encrypted and I have written down encryption passphrase. How to reset login password?

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http://askubuntu.com – I set up a friend with 12.04 and he forgot his password. I encrypted his home directory and I have written down the encryption passphrase during the first boot. If he changed his password after I wrote down the encryption passphrase during the first boot is this original encryption passphrase of any use? What should I do to reset or recover his password and keep everything accessible and functionally intact with the encrypted home directory? (HowTos)

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Submitted by missing on 09/08/2012

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I changed my password, and was unable to log on. I went into root area, and changed password there. When logging on, it kicks me back to main screen. I used ecryptfs-rewrap-passphrase /home/.ecryptfs/$USER/.ecryptfs/wrapped-passphrase, It asked for old wrapping passphrase, which I assumed was my initial password. It asked for new wrapping passphrase (twice). I got an error: Unwrapping passphrase

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Ok so let me summarize this up.

I encrypted my Home to protect against hackers of course when I first installed Ubuntu. It loaded up the Terminal and was attempting to show me my encryption password incase it ever needed to be used. So I thought "Ehh what the heck, I can find it out later..." So I closed Terminal and went on with the (amazing!) Ubuntu life.

#1 I'm very new to the ubuntu home directory encryption or rather ecryptfs folder encryption. I read about the same within Dustin's blog & tried implementing it. Problem or query is my home directory is encrypted & has a www folder ...