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 = initrd.lz =
 * [https://forums.ubuntulinux.jp/viewtopic.php?id=6874 Ubuntu日本語フォーラム / Ubuntu9.10 UCKでinitrdの編集]
  * [https://help.ubuntu.com/community/LiveCDCustomization LiveCDCustomization - Community Ubuntu Documentation]
  > Also, I have read a few articles mentioning that Karmic (9.10) uses initrd.lz instead of initrd.gz. I do not know if this is true, but should mention it in case you are not getting the expected results. To unpack the initrd.lz file, you need to do this: 
  > {{{
  > # cd extract-cd/casper
  > # mkdir lztempdir
  > # cd lztempdir
  > # lzma -dc -S .lz ../initrd.lz | cpio -imvd --no-absolute-filenames
  > }}}
  > And to re-create the initrd.lz file: 
  > {{{
  > # cp ../initrd.lz ../inird.lz.orig
  > # find . | cpio --quiet --dereference -o -H newc | lzma -7 > ../initrd.lz
  > }}}