xz-lzma 5.1.1alpha+20110809-2 (amd64 binary) in ubuntu precise

 XZ is the successor to the Lempel-Ziv/Markov-chain Algorithm
 compression format, which provides memory-hungry but powerful
 compression (often better than bzip2) and fast, easy decompression.
 .
 This package provides symbolic links allowing xz-utils to provide the
 same interface for manipulating LZMA files as the lzma package. The
 xz-utils package can handle LZMA files on its own; this package is
 only necessary when using scripts or other programs that require the
 older command names.