diff --git a/doc/getting_started/index.rst b/doc/getting_started/index.rst
index bb5292992b9..cf9c979591a 100644
--- a/doc/getting_started/index.rst
+++ b/doc/getting_started/index.rst
@@ -29,10 +29,11 @@ tools. First, make sure your development system OS is updated:
 
    .. group-tab:: Ubuntu
 
-      Use these commands to bring your Linux (Ubuntu) system up to date.
-      If you're using a different Linux distribution, use the appropriate
-      package manager for your OS.  (See :ref:`installation_linux` for
-      more information about other Linux distributions.)
+      This guide covers Ubuntu version 18.04 LTS and later. See
+      :ref:`installation_linux` for information about other Linux
+      distributions and older versions of Ubuntu.
+
+      Use these commands to bring your Ubuntu system up to date:
 
       .. code-block:: bash
 
@@ -94,16 +95,11 @@ We'll also install Zephyr's multi-purpose west tool.
 
                wget -O - https://apt.kitware.com/keys/kitware-archive-latest.asc 2>/dev/null | sudo apt-key add -
 
-         b) Add the kitware repo corresponding to your Ubuntu LTS release (use
-            ``cat /etc/os-release`` to check):
+         b) Add the kitware repo corresponding to the Ubuntu 18.04 LTS release:
 
-            For Ubuntu Bionic Beaver (18.04) use::
+            .. code-block:: bash
 
-              sudo apt-add-repository 'deb https://apt.kitware.com/ubuntu/ bionic main'
-
-            For Ubuntu Xenial Xerus (16.04) use::
-
-              sudo apt-add-repository 'deb https://apt.kitware.com/ubuntu/ xenial main'
+               sudo apt-add-repository 'deb https://apt.kitware.com/ubuntu/ bionic main'
 
          c) Then install the updated cmake using the usual apt commands:
 
diff --git a/doc/getting_started/installation_linux.rst b/doc/getting_started/installation_linux.rst
index 5aeb1016271..e0cc28218e2 100644
--- a/doc/getting_started/installation_linux.rst
+++ b/doc/getting_started/installation_linux.rst
@@ -192,6 +192,19 @@ more recent one by building from source, or use the one that is bundled in
 the :ref:`Zephyr SDK <zephyr_sdk>` by installing it and setting the
 :envvar:`ZEPHYR_SDK_INSTALL_DIR` environment variable.
 
+Python
+======
+
+Python 3.6 or later is required. Check what version you have by using ``python3
+--version``.
+
+If you have an older version, you will need to install a more recent Python 3.
+You can build from source, or use a backport from your distribution's package
+manager channels if one is available. Isolating this Python in a virtual
+environment is recommended to avoid interfering with your system Python.
+
+.. _pyenv: https://github.com/pyenv/pyenv
+
 .. _zephyr_sdk:
 
 Install the Zephyr Software Development Kit (SDK)