After upgrading from ubuntu 11.04 to 10.10 I cannot access my encrypted home partition anymore. I can login, however all data stays encrypted.

ecryptfs-mount-private 

gives:

ERROR: Encrypted private directory is not setup properly

Any idea how to fix this?

Update

I have several kernels installed (after the upgrade my menu.lst looks like this: http://paste.org/pastebin/view/35591) the problem is the same for all kernels. Booting from 2.6.32-27-generic and

adduser --encrypt-home tes

gives:

Adding user `tes' ...
Adding new group `tes' (1008) ...
Adding new user `tes' (1007) with group `tes' ...
Creating home directory `/home/tes' ...
Setting up encryption ...

************************************************************************
YOU SHOULD RECORD YOUR MOUNT PASSPHRASE AND STORE IT IN A SAFE LOCATION.
  ecryptfs-unwrap-passphrase ~/.ecryptfs/wrapped-passphrase
THIS WILL BE REQUIRED IF YOU NEED TO RECOVER YOUR DATA AT A LATER TIME.
************************************************************************

Error: Your kernel does not support filename encryption
ERROR:  Could not add passphrase to the current keyring
adduser: `/usr/bin/ecryptfs-setup-private -b -u tes' returned error code 1. Exiting.