Troubles with ecryptfs in oem-mode install

[Evgeniy Gurinovich]

Hello, I configure automatic install for Ubuntu 14.04 and in the end of process I activate oem-config-prepare that allow end user create own account, set hostname and etc and all works good. But if user select "Encrypt my home folder" - he can't login to system.

I checked logs and I found that:
Feb 6 15:06:51 tmppmKwJnu lightdm: pam_ecryptfs: Passphrase file wrapped
Feb 6 15:06:51 tmppmKwJnu lightdm: Error attempting to open [/home/erb334/.ecryptfs/wrapped-passphrase] for reading
Feb 6 15:06:51 tmppmKwJnu lightdm: Error attempting to unwrap passphrase from file [/home/erb334/.ecryptfs/wrapped-passphrase]; rc = [-5]
Feb 6 15:06:51 tmppmKwJnu lightdm: pam_ecryptfs: Error adding passphrase key token to user session keyring; rc = [-5]

FIle wrapped-passphrase not created for some reason.