[Bug 1571303] [NEW] lib/live/build/lb_binary_disk failed with "lzcat: : Invalid filename suffix" on Ubuntu 16.04

[Ｖ字龍(Vdragon)]

*** This bug is a duplicate of bug 1555980 ***
    https://bugs.launchpad.net/bugs/1555980

Public bug reported:

As title, I believe it's because that the command missing --suffix
option.

Also the xz(1) manpage mentions that:

```
When writing scripts that need to decompress files, it is recommended to always use the name xz with appropriate arguments (xz -d or xz -dc) instead of the names unxz and xzcat.

```

We should follow the recommendation, but that's another bug

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: live-build 3.0~a57-1ubuntu25
Uname: Linux 4.4.0-pf8-buo-ren-pf-intel-haswell-and-gcc-autodetect-optimized x86_64
ApportVersion: 2.20.1-0ubuntu2
Architecture: amd64
CurrentDesktop: Unity
Date: Sun Apr 17 16:50:58 2016
InstallationDate: Installed on 2016-01-07 (100 days ago)
InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
PackageArchitecture: all
SourcePackage: live-build
UpgradeStatus: Upgraded to xenial on 2016-04-07 (9 days ago)

** Affects: live-build (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug xenial

** This bug has been marked a duplicate of bug 1555980
   broke on binary stage by wrong on lzcat

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https://bugs.launchpad.net/bugs/1571303

Title:
  lib/live/build/lb_binary_disk failed with "lzcat: : Invalid filename
  suffix" on Ubuntu 16.04

Status in live-build package in Ubuntu:
  New

Bug description:
  As title, I believe it's because that the command missing --suffix
  option.

  Also the xz(1) manpage mentions that:

  ```
  When writing scripts that need to decompress files, it is recommended to always use the name xz with appropriate arguments (xz -d or xz -dc) instead of the names unxz and xzcat.

  ```

  We should follow the recommendation, but that's another bug

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: live-build 3.0~a57-1ubuntu25
  Uname: Linux 4.4.0-pf8-buo-ren-pf-intel-haswell-and-gcc-autodetect-optimized x86_64
  ApportVersion: 2.20.1-0ubuntu2
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Sun Apr 17 16:50:58 2016
  InstallationDate: Installed on 2016-01-07 (100 days ago)
  InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
  PackageArchitecture: all
  SourcePackage: live-build
  UpgradeStatus: Upgraded to xenial on 2016-04-07 (9 days ago)

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