[Bug 1665891] [NEW] use xz package compression

[Jérôme]

Public bug reported:

xz compression saves 26% of deb package size :
---
m at p:~$ rm -rf deb-tree/*
m at p:~$ dpkg-deb --raw-extract /var/cache/apt/archives/base-files_9.4ubuntu4.4_amd64.deb deb-tree
m at p:~$ dpkg-deb --build --nocheck --uniform-compression -Zxz -z9 deb-tree test.deb
dpkg-deb : avertissement : pas de contrôle du contenu de la zone de contrôle
dpkg-deb : construction d'un paquet inconnu dans « test.deb ».
m at p:~$ ls -l test.deb 
-rw-r--r-- 1 m m 44664 févr. 18 15:17 test.deb
m at p:~$ ls -l /var/cache/apt/archives/base-files_9.4ubuntu4.4_amd64.deb
-rw-r--r-- 1 root root 60156 févr.  8 21:03 /var/cache/apt/archives/base-files_9.4ubuntu4.4_amd64.deb
m at p:~$
---

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: base-files 9.4ubuntu4.4
ProcVersionSignature: Ubuntu 4.4.0-62.83-generic 4.4.40
Uname: Linux 4.4.0-62-generic x86_64
NonfreeKernelModules: wl
ApportVersion: 2.20.1-0ubuntu2.5
Architecture: amd64
CurrentDesktop: XFCE
Date: Sat Feb 18 15:17:58 2017
Dependencies:
 
InstallationDate: Installed on 2017-02-01 (16 days ago)
InstallationMedia: Xubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
SourcePackage: base-files
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: base-files (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug xenial

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https://bugs.launchpad.net/bugs/1665891

Title:
  use xz package compression

Status in base-files package in Ubuntu:
  New

Bug description:
  xz compression saves 26% of deb package size :
  ---
  m at p:~$ rm -rf deb-tree/*
  m at p:~$ dpkg-deb --raw-extract /var/cache/apt/archives/base-files_9.4ubuntu4.4_amd64.deb deb-tree
  m at p:~$ dpkg-deb --build --nocheck --uniform-compression -Zxz -z9 deb-tree test.deb
  dpkg-deb : avertissement : pas de contrôle du contenu de la zone de contrôle
  dpkg-deb : construction d'un paquet inconnu dans « test.deb ».
  m at p:~$ ls -l test.deb 
  -rw-r--r-- 1 m m 44664 févr. 18 15:17 test.deb
  m at p:~$ ls -l /var/cache/apt/archives/base-files_9.4ubuntu4.4_amd64.deb
  -rw-r--r-- 1 root root 60156 févr.  8 21:03 /var/cache/apt/archives/base-files_9.4ubuntu4.4_amd64.deb
  m at p:~$
  ---

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: base-files 9.4ubuntu4.4
  ProcVersionSignature: Ubuntu 4.4.0-62.83-generic 4.4.40
  Uname: Linux 4.4.0-62-generic x86_64
  NonfreeKernelModules: wl
  ApportVersion: 2.20.1-0ubuntu2.5
  Architecture: amd64
  CurrentDesktop: XFCE
  Date: Sat Feb 18 15:17:58 2017
  Dependencies:
   
  InstallationDate: Installed on 2017-02-01 (16 days ago)
  InstallationMedia: Xubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
  SourcePackage: base-files
  UpgradeStatus: No upgrade log present (probably fresh install)

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