deb archives should use lzma compression

[Jérôme]

j@dt-X64:~/tmp$ 7z x /var/cache/apt/archives/gthumb-data_3%3a2.14.3-0ubuntu1_all.deb

7-Zip [64] 9.20 Copyright (c) 1999-2010 Igor Pavlov 2010-11-18
p7zip Version 9.20 (locale=fr_FR.UTF-8,Utf16=on,HugeFiles=on,1 CPU)

Processing archive: /var/cache/apt/archives/gthumb-data_3%3a2.14.3-0ubuntu1_all.deb

Extracting data.tar

Everything is Ok

Size: 9912320
Compressed: 4951616
j@dt-X64:~/tmp$ gzip --best --stdout data.tar > data.tar.gz
j@dt-X64:~/tmp$ bzip2 --best --stdout data.tar > data.tar.bz2
j@dt-X64:~/tmp$ lzma --best --stdout data.tar > data.tar.lzma
j@dt-X64:~/tmp$ xz -9e --stdout data.tar > data.tar.xz
j@dt-X64:~/tmp$ ls -lh
total 27M
-rw-rw-r-- 1 j j 9,5M avril 11 09:13 data.tar
-rw-rw-r-- 1 j j 4,3M avril 14 10:03 data.tar.bz2
-rw-rw-r-- 1 j j 4,8M avril 14 10:03 data.tar.gz
-rw-rw-r-- 1 j j 3,9M avril 14 10:04 data.tar.lzma
-rw-rw-r-- 1 j j 3,9M avril 14 10:04 data.tar.xz
j@dt-X64:~/tmp$

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: gthumb-data 3:2.14.3-0ubuntu1
ProcVersionSignature: Ubuntu 3.2.0-23.36-generic 3.2.14
Uname: Linux 3.2.0-23-generic x86_64
ApportVersion: 2.0.1-0ubuntu2
Architecture: amd64
Date: Sat Apr 14 10:05:43 2012
InstallationMedia: Xubuntu 12.04 LTS "Precise Pangolin" - Beta amd64 (20120328)
PackageArchitecture: all
SourcePackage: gthumb
UpgradeStatus: No upgrade log present (probably fresh install)