Missing lightbox.js in /usr/share/javascript/

[Set Hallstrom]

Reproduce:

In the lighttable: Select a few images, then press "Export to Web Gallery"

Expected result: Deployable folder containing a Web Gallery is exported with lightbox capabilities.

Result: Deployable folder contains a Web Gallery but has no lightbox capabilities because "lightbox.js" is missing somewhere in /usr/share/javascript/

Might be related:
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=713974
https://redmine.darktable.org/issues/10767

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: darktable 2.0.3-1
ProcVersionSignature: Ubuntu 4.4.0-22.40-lowlatency 4.4.8
Uname: Linux 4.4.0-22-lowlatency x86_64
NonfreeKernelModules: nvidia_uvm nvidia_modeset nvidia
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
CurrentDesktop: XFCE
Date: Wed Jun 8 12:21:30 2016
InstallationDate: Installed on 2016-04-21 (47 days ago)
InstallationMedia: Ubuntu-Studio 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
SourcePackage: darktable
UpgradeStatus: No upgrade log present (probably fresh install)