how to change password of an enrypted ubuntu user account?

Question

I changed my ubuntu user password using:

$ sudo passwd

now when I reboot and login using the new password, following warning is displayed:

Signature not found in user keyring
perhaps try the interactive 'ecrypt-mount-private'

Also

$ ls command 

shows only these 2 dir: Access-your-private-data.desktop and README.txt

I tried to start the graphical interface using:

$ startx

but recieved the following error:

timeout in accessing locking authority file /home/my_username(aman)/.Xauthority

I remember my old and new passwords but forgot the passphrase, so retrieved it using:

$ ecryptfs-unwrap-passphrase /home/aman/.ecryptfs/wrapped-passphrase

After this I'm not able to make out how to proceed and login to my home foler in graphical interface.

Solution

To fix this, simply run:

ecryptfs-rewrap-passphrase /home/.ecryptfs/$USER/.ecryptfs/wrapped-passphrase

It will prompt you for your old passphrase, then allow you to enter a new one. Then, you will be able to log in normally.

Found on: https://askubuntu.com/a/439290/254032

Comments

[XavierStuvw]

ecryptfs-rewrap-passphrase caused me some troubles. See description unix.stackexchange.com/questions/329661 for your consideration

[Czarek Tomczak]

On other forums found a hint that you cannot change user password before running ecryptfs-rewrap-passphrase. If you did it, restore old user password and change it only after running the rewrap command.