Bug#570388: xulrunner-1.9.1: Preinst fails if /usr/lib/mozilla does not exist

[Theppitak Karoonboonyanan]

Package: xulrunner-1.9.1
Version: 1.9.1.8-1
Severity: important

On upgrading xulrunner-1.9.1.6-2 to 1.9.1.8-1:

---8<---
Preparing to replace xulrunner-1.9.1 1.9.1.6-2 (using .../xulrunner-1.9.1_1.9.1.8-1_amd64.deb) ...
dpkg: error processing /var/cache/apt/archives/xulrunner-1.9.1_1.9.1.8-1_amd64.deb (--unpack):
 subprocess new pre-installation script returned error exit status 1
Errors were encountered while processing:
 /var/cache/apt/archives/xulrunner-1.9.1_1.9.1.8-1_amd64.deb
---8<---

The new preinst has this line added:

+    chmod -f 755 /usr/lib/mozilla /usr/lib/mozilla/extensions

This will fail if /usr/lib/mozilla does not exist, i.e. no mozilla extension
nor iceweasel installed.

-- System Information:
Debian Release: squeeze/sid
  APT prefers unstable
  APT policy: (500, 'unstable')
Architecture: amd64 (x86_64)

Kernel: Linux 2.6.32-trunk-amd64 (SMP w/2 CPU cores)
Locale: LANG=th_TH.UTF-8, LC_CTYPE=th_TH.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash

Versions of packages xulrunner-1.9.1 depends on:
ii  libasound2              1.0.22-1         shared library for ALSA applicatio
ii  libatk1.0-0             1.28.0-1         The ATK accessibility toolkit
ii  libbz2-1.0              1.0.5-4          high-quality block-sorting file co
ii  libc6                   2.10.2-6         Embedded GNU C Library: Shared lib
ii  libcairo2               1.8.8-2          The Cairo 2D vector graphics libra
ii  libdbus-1-3             1.2.20-2         simple interprocess messaging syst
ii  libfontconfig1          2.8.0-2          generic font configuration library
ii  libfreetype6            2.3.11-1         FreeType 2 font engine, shared lib
ii  libgcc1                 1:4.4.3-2        GCC support library
ii  libglib2.0-0            2.22.4-1         The GLib library of C routines
ii  libgtk2.0-0             2.18.6-1         The GTK+ graphical user interface 
ii  libhunspell-1.2-0       1.2.8-6          spell checker and morphological an
ii  libjpeg62               6b-16.1          The Independent JPEG Group's JPEG 
ii  libmozjs2d              1.9.1.8-1        The Mozilla SpiderMonkey JavaScrip
ii  libnspr4-0d             4.8.3-1          NetScape Portable Runtime Library
ii  libnss3-1d              3.12.5-2         Network Security Service libraries
ii  libpango1.0-0           1.26.2-1thep1    Layout and rendering of internatio
ii  libpng12-0              1.2.42-2         PNG library - runtime
ii  libreadline6            6.1-1            GNU readline and history libraries
ii  libsqlite3-0            3.6.22-1         SQLite 3 shared library
ii  libstartup-notification 0.10-1           library for program launch feedbac
ii  libstdc++6              4.4.3-2          The GNU Standard C++ Library v3
ii  libx11-6                2:1.3.3-1        X11 client-side library
ii  libxrender1             1:0.9.5-1        X Rendering Extension client libra
ii  libxt6                  1:1.0.7-1        X11 toolkit intrinsics library
ii  zlib1g                  1:1.2.3.4.dfsg-3 compression library - runtime

Versions of packages xulrunner-1.9.1 recommends:
ii  libdbus-glib-1-2              0.84-1     simple interprocess messaging syst
ii  libgconf2-4                   2.28.0-1   GNOME configuration database syste
ii  libgnome2-0                   2.28.0-1   The GNOME library - runtime files
ii  libgnomeui-0                  2.24.2-1   The GNOME libraries (User Interfac
ii  libgnomevfs2-0                1:2.24.2-2 GNOME Virtual File System (runtime

xulrunner-1.9.1 suggests no packages.

-- no debconf information