initramfs-tools 0.69ubuntu23 (amd64 binary) in ubuntu feisty

 This package contains tools to create and boot an initramfs for prepackaged
 2.6 Linux kernel. The initramfs is a gzipped cpio archive. At boot time, the
 kernel unpacks that archive into RAM, mounts and uses it as initial root file
 system. From there on the mounting of the real root file system occurs in user
 space. klibc handles the boot-time networking setup. Having the root on NFS
 is also supported.
 Any boot loader with initrd support is able to load an initramfs archive.