Disambiguate 'Linux' references in text

source/Installation.rst

@@ -28,7 +28,7 @@ Binary packages
 
 We currently provide ROS 2 binary packages for the following platforms:
 
-* Linux (Ubuntu Focal(20.04))
+* Ubuntu Linux - Focal Fossa (20.04)
 
  * `Debian packages <Installation/Ubuntu-Install-Debians>`
  * `"fat" archive <Installation/Ubuntu-Install-Binary>`
@@ -47,7 +47,7 @@ Building from source
 We support building ROS 2 from source on the following platforms:
 
 
-* `Linux <Installation/Ubuntu-Development-Setup>`
+* `Ubuntu Linux <Installation/Ubuntu-Development-Setup>`
 * `macOS <Installation/macOS-Development-Setup>`
 * `Windows <Installation/Windows-Development-Setup>`
 

source/Installation/DDS-Implementations.rst

@@ -28,8 +28,8 @@ Detailed instructions for installing other DDS vendors are provided below.
  :depth: 1
  :local:
 
-Linux source install
---------------------
+Ubuntu Linux source install
+---------------------------
 
 RTI Connext (version 5.3.1, amd64 only)
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -81,8 +81,8 @@ Source the setup file to set the ``NDDSHOME`` environment variable.
 
 Now you can build as normal and support for RTI will be built as well.
 
-Linux binary install
---------------------
+Ubuntu Linux binary install
+---------------------------
 
 RTI Connext (version 5.3.1, amd64 only)
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

source/Installation/Latest-Development-Setup.rst

@@ -19,7 +19,7 @@ Building from source
 
 Follow the links below for the latest setup instructions for your platform:
 
-* `Linux <Ubuntu-Development-Setup>`
+* `Ubuntu Linux <Ubuntu-Development-Setup>`
 * `macOS <macOS-Development-Setup>`
 * `Windows <Windows-Development-Setup>`
 

source/Installation/Prerelease-Testing.rst

@@ -58,7 +58,7 @@ For Debian-based operating systems, you can install binary packages from the **r
 Fat binaries
 ------------
 
-For core packages, we run nightly packaging jobs for Linux, macOS, and Windows.
+For core packages, we run nightly packaging jobs for Ubuntu Linux, macOS, and Windows.
 These packaging jobs produce archives with pre-built binaries that can be downloaded and extracted to your filesystem.
 
 1. Make sure you have all dependencies installed according to the `latest development setup <Latest-Development-Setup>` for your platform.
@@ -94,7 +94,7 @@ These packaging jobs produce archives with pre-built binaries that can be downlo
 Docker
 ------
 
-For Linux, there is also a nightly Docker image based on the nightly fat archive.
+For Ubuntu Linux, there is also a nightly Docker image based on the nightly fat archive.
 
 1. Pull the Docker image:
 

source/Installation/Ubuntu-Development-Setup.rst

@@ -4,8 +4,8 @@
 
  Installation/Linux-Development-Setup
 
-Building ROS 2 on Linux
-=======================
+Building ROS 2 on Ubuntu Linux
+==============================
 
 .. contents:: Table of Contents
  :depth: 2
@@ -14,18 +14,19 @@ Building ROS 2 on Linux
 
 System requirements
 -------------------
-The current target platforms for Rolling Ridley are
+The current Debian-based target platforms for Rolling Ridley are:
 
 - Tier 1: Ubuntu Linux - Focal Fossa (20.04) 64-bit
+- Tier 3: Debian Linux - Bullseye (11) 64-bit
 
-Tier 3 platforms (not actively tested or supported) include:
 
-- Debian Linux - Buster (10)
-- Fedora 32, see `alternate instructions <Fedora-Development-Setup>`
+Other Linux platforms with varying support levels include:
+
 - Arch Linux, see `alternate instructions <https://wiki.archlinux.org/index.php/ROS#ROS_2>`__
+- Fedora Linux, see `alternate instructions <Fedora-Development-Setup>`
 - OpenEmbedded / webOS OSE, see `alternate instructions <https://github.com/ros/meta-ros/wiki/OpenEmbedded-Build-Instructions>`__
 
-As defined in `REP 2000 <https://www.ros.org/reps/rep-2000.html>`_
+As defined in `REP 2000 <https://www.ros.org/reps/rep-2000.html>`_.
 
 System setup
 ------------

source/Installation/Ubuntu-Install-Binary.rst

@@ -2,14 +2,14 @@
 
  Installation/Linux-Install-Binary
 
-Installing ROS 2 on Linux
-=========================
+Installing ROS 2 on Ubuntu Linux
+================================
 
 .. contents:: Table of Contents
  :depth: 2
  :local:
 
-This page explains how to install ROS 2 on Linux from a pre-built binary package.
+This page explains how to install ROS 2 on Ubuntu Linux from a pre-built binary package.
 
 .. note::
 
@@ -37,7 +37,7 @@ Downloading ROS 2
 Binary releases of Rolling Ridley are not provided.
 Instead you may download nightly `prerelease binaries <Prerelease_binaries>`.
 
-* Download the latest package for Linux; let's assume that it ends up at ``~/Downloads/ros2-package-linux-x86_64.tar.bz2``.
+* Download the latest package for Ubuntu; let's assume that it ends up at ``~/Downloads/ros2-package-linux-x86_64.tar.bz2``.
 
  * Note: there may be more than one binary download option which might cause the file name to differ.
 

source/Tutorials/Building-ROS-2-on-Linux-with-Eclipse-Oxygen.rst

@@ -86,7 +86,7 @@ Add export RTI_LICENSE_FILE=/home/ros/rti_connext_dds-5.3.1/rti_license.dat to .
 
 
 An RTI license is now needed, which we can get on their website.
-Refer to `Linux Development Setup page <../Installation/Ubuntu-Development-Setup>`.
+Refer to `Ubuntu Linux Development Setup page <../Installation/Ubuntu-Development-Setup>`.
 The RTI license file will be directly sent via email after sign-up.
 
 In the email is a link to the RTI software to download.