What is the "Install this third-party software" box in the installer and what third-party software is installed?

Solution 1:

Edit

After digging some more through output of

dpkg --get-selections | xargs apt-cache policy | grep -B5 'multiverse' it turns out there exists meta-package ubuntu-restricted-addons. The /var/lib/dpkg/info/ubuntu-restricted-addons.list pointed me to the file /usr/share/doc/ubuntu-restricted-addons/README.Debian

The contents of that file state:

This package was split into ubuntu-restricted-extras and ubuntu-restricted-addons to allow the desktop CD installer (ubiquity) to install a subset of the packages available in the original ubuntu-restricted-extras package.

Moving forward, ubuntu-restricted-extras should only contain multiverse packages, whereas ubuntu-restricted-addons should contain main and universe packages, as well as any packages from multiverse that have been vetted by a lawyer.

Since ubuntu-restricted-extras depends on ubuntu-restricted-addons, users should be discouraged from installing ubuntu-restricted-addons outside of the desktop CD installer. This is the reasoning behind the warning and sparse description in ubuntu-restricted-addons.

-- Evan Dandrea Thu, 05 Aug 2010 16:14:43 -0400

Thus, Ubuntu installer allows you to install ubuntu-restricted-addons meta-package.

apt-cache tells us what goes into that package:

xieerqi:
$ apt-cache depends ubuntu-restricted-addons                                                                            
ubuntu-restricted-addons
  Recommends: gstreamer0.10-plugins-ugly
  Recommends: gstreamer1.0-plugins-ugly
  Recommends: flashplugin-installer
    flashplugin-installer:i386
  Recommends: gstreamer0.10-plugins-bad
  Recommends: gstreamer1.0-plugins-bad
  Recommends: gstreamer1.0-libav
  Recommends: gstreamer0.10-fluendo-mp3
  Recommends: gstreamer1.0-fluendo-mp3
  Recommends: chromium-codecs-ffmpeg-extra
  Recommends: oxideqt-codecs-extra
  Conflicts: ubuntu-restricted-addons:i386

This is pretty much the same output as on my 15.10 virtual machine.

Thus , my conclusion is that ubuntu-restricted-addons from multiverse repository is where the third-party software comes from.

Original post In terms of /etc/apt/sources.list file those would be any software that comes from deb http://archive.ubuntu.com/ubuntu $RELEASE multiverse as well as deb http://archive.ubuntu.com/ubuntu $RELEASE restricted repository.

It's also references in the software-properties-gtk program

You can list packages in those repositories with

awk '/^Package/' /var/lib/apt/lists/archive.ubuntu.com_ubuntu_dists_$(lsb_release -c | awk '{print $2}' )_multiverse_binary-$(dpkg --print-architecture)_Packages

and

awk '/^Package/' /var/lib/apt/lists/archive.ubuntu.com_ubuntu_dists_$(lsb_release -c | awk '{print $2}' )_restricted_binary-$(dpkg --print-architecture)_Packages

Solution 2:

What it installs is ubuntu-restricted-extras for playback of media that is not encrypted but using a proprietary codec (mainly mp3, mp4).

It is part of the Fluendo package. Fluendo is a Canonical partner so their own software is in the partner repository. gstreamer0.10-fluendo-plugins is the name of it and it has all of their playback codecs but has a price of $34.95

Solution 3:

The message "...uses third-party software to play Flash, MP3 and other media..." is in a package named ubiquity and it is Template: ubiquity/text/prepare_foss_disclaimer.

Template: ubiquity/text/prepare_nonfree_software is the label of the checkbox which contains the text "Install this third-party software"

In the file ubiquity/plugins/ubi-prepare.py there is a def ok_handler(self) that checks if that checkbox was clicked on into the active state and sets a varible use_nonfree to true if it was. If use_nonfree is true it causes universe and multiverse to be preseeded and if it hasn't already done so it causes ubuntu-restricted-addons (or kubuntu-restricted-addons if it's KDE) to be preseeded.

It does nothing with ubuntu-restricted-extras, only ubuntu-restricted-addons. There is even a changelog entry explaining this is true.

./ubiquity-2.18.8.11/debian/changelog: * Install kubuntu-restricted-addons, not kubuntu-restricted-extras