doc: update docs to remove references of ubuntu 14.04

Signed-off-by: Kefu Chai <kchai@redhat.com>

doc/dev/index.rst

@@ -760,7 +760,7 @@ installed on any machine running those platforms.
 
 Teuthology has a `list of platforms that it supports
 <https://github.com/ceph/ceph/tree/master/qa/distros/supported>`_ (as
-of March 2016 the list consisted of "CentOS 7.2" and "Ubuntu 14.04").  It
+of December 2017 the list consisted of "CentOS 7.2" and "Ubuntu 16.04").  It
 expects to be provided pre-built Ceph packages for these platforms.
 Teuthology deploys these platforms on machines (bare-metal or
 cloud-provisioned), installs the packages on them, and deploys Ceph
@@ -1028,31 +1028,31 @@ subdirectories in the following structure::
       file: %
       directory: distros
          file: centos_7.0.yaml
-         file: ubuntu_14.04.yaml
+         file: ubuntu_16.04.yaml
       directory: tasks
          file: ceph-disk.yaml
 
 This is interpreted as a 2x1 matrix consisting of two tests: 
 
 1. ceph-disk/basic/{distros/centos_7.0.yaml tasks/ceph-disk.yaml}
-2. ceph-disk/basic/{distros/ubuntu_14.04.yaml tasks/ceph-disk.yaml}
+2. ceph-disk/basic/{distros/ubuntu_16.04.yaml tasks/ceph-disk.yaml}
 
 i.e. the concatenation of centos_7.0.yaml and ceph-disk.yaml and
-the concatenation of ubuntu_14.04.yaml and ceph-disk.yaml, respectively.
+the concatenation of ubuntu_16.04.yaml and ceph-disk.yaml, respectively.
 In human terms, this means that the task found in ``ceph-disk.yaml`` is
-intended to run on both CentOS 7.0 and Ubuntu 14.04.
+intended to run on both CentOS 7.0 and Ubuntu 16.04.
 
 Without the file percent, the ``ceph-disk`` tree would be interpreted as
 three standalone tests:
 
 * ceph-disk/basic/distros/centos_7.0.yaml
-* ceph-disk/basic/distros/ubuntu_14.04.yaml
+* ceph-disk/basic/distros/ubuntu_16.04.yaml
 * ceph-disk/basic/tasks/ceph-disk.yaml
 
 (which would of course be wrong in this case).
 
 Referring to the `ceph/qa sub-directory`_, you will notice that the
-``centos_7.0.yaml`` and ``ubuntu_14.04.yaml`` files in the
+``centos_7.0.yaml`` and ``ubuntu_16.04.yaml`` files in the
 ``suites/ceph-disk/basic/distros/`` directory are implemented as symlinks.
 By using symlinks instead of copying, a single file can appear in multiple
 suites. This eases the maintenance of the test framework as a whole.
@@ -1067,7 +1067,7 @@ An individual test from the `ceph-disk suite`_ can be run by adding the
 
   $ teuthology-suite \
       --suite ceph-disk/basic \
-      --filter 'ceph-disk/basic/{distros/ubuntu_14.04.yaml tasks/ceph-disk.yaml}'
+      --filter 'ceph-disk/basic/{distros/ubuntu_16.04.yaml tasks/ceph-disk.yaml}'
 
 .. note: To run a standalone test like the one in `Reading a standalone
    test`_, ``--suite`` alone is sufficient. If you want to run a single

doc/man/8/ceph-detect-init.rst

@@ -46,7 +46,6 @@ Bugs
 
 :program:`ceph-detect-init` is used by :program:`ceph-disk` to figure out the init system to manage the mount directory of an OSD. But only following combinations are fully tested:
 
-- `upstart` on `Ubuntu 14.04`
 - `systemd` on `Ubuntu 15.04` and up
 - `systemd` on `Debian 8` and up
 - `systemd` on `RHEL/CentOS 7` and up

doc/man/8/radosgw.rst

@@ -182,12 +182,9 @@ tcp and through unix domain socket:
 
 		</VirtualHost>
 
-   The latest version of Ubuntu i.e, 14.04 ships with ``Apache 2.4.7`` that
-   does not have Unix Domain Socket support in it and as such it has to be
-   configured with localhost tcp. The Unix Domain Socket support is available in
-   ``Apache 2.4.9`` and later versions. A bug has been filed to backport the UDS
-   support to ``Apache 2.4.7`` for ``Ubuntu 14.04``.
-   See: https://bugs.launchpad.net/ubuntu/+source/apache2/+bug/1411030
+   Please note, ``Apache 2.4.7`` does not have Unix Domain Socket support in
+   it and as such it has to be configured with localhost tcp. The Unix Domain
+   Socket support is available in ``Apache 2.4.9`` and later versions.
 
 #. Generate a key for radosgw to use for authentication with the cluster. ::
 

doc/rados/deployment/preflight-checklist.rst

@@ -16,7 +16,7 @@ daemons.
 Install an Operating System
 ===========================
 
-Install a recent release of Debian or Ubuntu (e.g., 12.04 LTS, 14.04 LTS) on
+Install a recent release of Debian or Ubuntu (e.g., 16.04 LTS) on
 your nodes. For additional details on operating systems or to use other
 operating systems other than Debian or Ubuntu, see `OS Recommendations`_.
 

doc/rados/operations/add-or-rm-mons.rst

@@ -45,7 +45,7 @@ Deploy your Hardware
 If you are adding a new host when adding a new monitor,  see `Hardware
 Recommendations`_ for details on minimum recommendations for monitor hardware.
 To add a monitor host to your cluster, first make sure you have an up-to-date
-version of Linux installed (typically Ubuntu 14.04 or RHEL 7). 
+version of Linux installed (typically Ubuntu 16.04 or RHEL 7). 
 
 Add your monitor host to a rack in your cluster, connect it to the network
 and ensure that it has network connectivity.