Binary package “cryptsetup-initramfs” in ubuntu kinetic

disk encryption support - initramfs integration

 Cryptsetup provides an interface for configuring encryption on block
 devices (such as /home or swap partitions), using the Linux kernel
 device mapper target dm-crypt. It features integrated Linux Unified Key
 Setup (LUKS) support.
 .
 This package provides initramfs integration for cryptsetup.