login is no longer possible after changing my passwort

Hi,
I recently changed my password and removed fingerprint-gui via apt. after i rebooted the pc i was no longer able to login via lightdm but i can login at ttyx.

after login i get the message
"Signature not found in user keyring"
and I'm not able to access my encrypted home-folder.

I tried to use ecryptfs-mount-private but i got this error:
"Inserted auth tok with sig [xxxxxxx] into the user session keyring
Signature not found in user keyring
Perhaps try the interactive 'ecryptfs-mount-private' "

I was able to discover my ./Privat directory with ecryptfs-recover-private but after inserting my passphrase I got the following error:
"Inserted auth tok with sig [xxxxxxx] into the user session keyring
ERROR: The key required to access this private data is not available."

I changed my passwort back to the one I used before with passwd and checked it with ecryptfs-unwrap-passphrase. now the passwords shoul all be like befor but I am still not able to login.

I hope that anyone can help :-(
I'm using KDE Neon 5.10.4 which is based on Ubuntu.

Greetings
Moritz