Debian/Ubuntu: Cleanup and update index pages

Signed-off-by: Richard Laager <rlaager@wiktel.com>

docs/Getting Started/Debian/index.rst

@@ -1,65 +1,46 @@
+.. highlight:: sh
+
 Debian
 ======
 
-`DKMS <https://en.wikipedia.org/wiki/Dynamic_Kernel_Module_Support>`__
-style packages are available from the `Debian GNU/Linux
-repository <https://tracker.debian.org/pkg/zfs-linux>`__ for the
-following configurations. The packages previously hosted at
-archive.zfsonlinux.org will not be updated and are not recommended for
-new installations.
-
-**Debian Releases:** Stretch (oldstable), Buster (stable), and newer
-(testing, sid) **Architectures:** amd64
-
 .. contents:: Table of Contents
   :local:
 
 Installation
 ------------
 
-For Debian Buster, ZFS packages are included in the `contrib
-repository <https://packages.debian.org/source/buster/zfs-linux>`__.
+If you want to use ZFS as your root filesystem, see the `Root on ZFS`_
+links below instead.
 
-If you want to boot from ZFS, see
-:doc:`Debian Buster Root on ZFS <./Debian Buster Root on ZFS>`
-instead.
-For troubleshooting existing installations on Stretch, see
-:doc:`Debian Stretch Root on ZFS <./Debian Stretch Root on ZFS>`.
+ZFS packages are included in the `contrib repository
+<https://packages.debian.org/source/zfs-linux>`__. The
+`backports repository <https://backports.debian.org/Instructions/>`__
+often provides newer releases of ZFS. You can use it as follows.
 
-The `backports
-repository <https://backports.debian.org/Instructions/>`__ often
-provides newer releases of ZFS. You can use it as follows:
+Add the backports repository::
 
-Add the backports repository:
+  vi /etc/apt/sources.list.d/buster-backports.list
 
-::
+.. code-block:: sourceslist
 
-   # vi /etc/apt/sources.list.d/buster-backports.list
    deb http://deb.debian.org/debian buster-backports main contrib
    deb-src http://deb.debian.org/debian buster-backports main contrib
 
-   # vi /etc/apt/preferences.d/90_zfs
+::
+
+  vi /etc/apt/preferences.d/90_zfs
+
+.. code-block:: control
+
   Package: libnvpair1linux libuutil1linux libzfs2linux libzpool2linux spl-dkms zfs-dkms zfs-test zfsutils-linux zfsutils-linux-dev zfs-zed
   Pin: release n=buster-backports
   Pin-Priority: 990
 
-Update the list of packages:
+Install the packages::
 
-::
-
-   # apt update
-
-Install the kernel headers and other dependencies:
-
-::
-
-   # apt install --yes dpkg-dev linux-headers-$(uname -r) linux-image-amd64
-
-Install the zfs packages:
-
-::
-
-   # apt-get install zfs-dkms zfsutils-linux
+  apt update
+  apt install dpkg-dev linux-headers-$(uname -r) linux-image-amd64
+  apt install zfs-dkms zfsutils-linux
 
 Root on ZFS
 -----------

docs/Getting Started/Ubuntu/index.rst

@@ -1,8 +1,20 @@
 Ubuntu
 ======
 
-ZFS packages are `provided by the
-distribution <https://wiki.ubuntu.com/Kernel/Reference/ZFS>`__.
+.. contents:: Table of Contents
+  :local:
+
+Installation
+------------
+
+If you want to use ZFS as your root filesystem, see the `Root on ZFS`_
+links below instead.
+
+Since Ubuntu 16.04, ZFS is included in the default Linux kernel packages.  To
+install the ZFS utilities::
+
+  apt update
+  apt install zfsutils-linux
 
 Root on ZFS
 -----------