doc: add Python 2 to Ubuntu 18.04 installations

This commit updates the "Create a Cluster" section of the
"Storage Cluster Quick Start" document. Ubuntu 18.04 does
not have Python 2 installed by default. This commit instructs
users of Python 18.04 to install the package "python-minimal"
to provide Python 2 prior to running "ceph-deploy".

This commit fixes Bug number 9 in the list here:
https://pad.ceph.com/p/Report_Documentation_Bugs

Signed-off-by: Zac Dover <zac.dover@gmail.com>

diff --git a/doc/start/quick-ceph-deploy.rst b/doc/start/quick-ceph-deploy.rst
index c9fe534840c10e6856826ce10be6cf7fb13ff8ea..c4589c7b3d3c91cc83bb18eee8328eac64cd65f7 100644 (file)
--- a/doc/start/quick-ceph-deploy.rst
+++ b/doc/start/quick-ceph-deploy.rst
@@ -62,6 +62,12 @@ configuration details, perform the following steps using ``ceph-deploy``.
    and a log file for the new cluster.  See `ceph-deploy new -h`_ for
    additional details.
 
+   Note for users of Ubuntu 18.04: Python 2 is a prerequisite of Ceph.
+   Install the ``python-minimal`` package on Ubuntu 18.04 to provide
+   Python 2::
+
+     [Ubuntu 18.04] $ sudo apt install python-minimal
+
 #. If you have more than one network interface, add the ``public network``
    setting under the ``[global]`` section of your Ceph configuration file.
    See the `Network Configuration Reference`_ for details. ::