[Bug 811874] [NEW] casper should depend on lzma

[Lekensteyn]

Public bug reported:

/usr/bin/update-initramfs is a symlink to /usr/share/casper/casper-update-initramfs
If /cdrom/casper/initrd.lz exists, the initial ramdisk is compressed using lzma. That package was not available in a Live session.

Two solutions are available:
1. Depend on lzma
2. Check if lzma compression is available and otherwise stick to gzip

I booted from a Kubuntu 11.04 Natty Live CD and used the `toram` option to speed up the Live session.
To reproduce it:
1. boot into a Live CD (with the `toram` option?)
2. update the packages list: sudo apt-get update
3. upgrade the system: sudo apt-get upgrade
update-initramfs is triggered by plymouth or initramfs-tools:

 initramfs-tools
 plymouth
 plymouth-label
 plymouth-theme-ubuntu-text
 plymouth-theme-kubuntu-text

The error message was (the last two lines have been translated from
Dutch):

update-initramfs: deferring update (trigger activated)
/usr/sbin/update-initramfs: 20: lzma: not found
dpkg: error while processing initramfs-tools (--configure):
 subproces installed post-installation script returned error code 127

Version:
ii  casper                 1.265                  Run a "live" preinstalled system from read-only media

** Affects: casper (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/811874

Title:
  casper should depend on lzma

Status in “casper” package in Ubuntu:
  New

Bug description:
  /usr/bin/update-initramfs is a symlink to /usr/share/casper/casper-update-initramfs
  If /cdrom/casper/initrd.lz exists, the initial ramdisk is compressed using lzma. That package was not available in a Live session.

  Two solutions are available:
  1. Depend on lzma
  2. Check if lzma compression is available and otherwise stick to gzip

  I booted from a Kubuntu 11.04 Natty Live CD and used the `toram` option to speed up the Live session.
  To reproduce it:
  1. boot into a Live CD (with the `toram` option?)
  2. update the packages list: sudo apt-get update
  3. upgrade the system: sudo apt-get upgrade
  update-initramfs is triggered by plymouth or initramfs-tools:

   initramfs-tools
   plymouth
   plymouth-label
   plymouth-theme-ubuntu-text
   plymouth-theme-kubuntu-text

  The error message was (the last two lines have been translated from
  Dutch):

  update-initramfs: deferring update (trigger activated)
  /usr/sbin/update-initramfs: 20: lzma: not found
  dpkg: error while processing initramfs-tools (--configure):
   subproces installed post-installation script returned error code 127

  Version:
  ii  casper                 1.265                  Run a "live" preinstalled system from read-only media

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