Draft inline for installing USB image with GNOME Disks

wiki/src/install/inc/steps/install_gnome_disks.inline.mdwn

+1. Start <span class="application">GNOME Disks</span> (also called
+   <span class="application">Disks</span>).
+
+   <div class="debian">
+     XXX Need to update example below (GNOME has "Activities" instead of an "Applications" menu)
+
+     For example, you can choose <span class="menuchoice">
+       <span class="guimenu">Applications</span>&nbsp;▸
+       <span class="guisubmenu">Utilities</span>&nbsp;▸
+       <span class="guimenuitem">Disks</span></span>.
+   </div>
+   <div class="upgrade">
+   Choose <span class="menuchoice">
+     <span class="guimenu">Applications</span>&nbsp;▸
+     <span class="guisubmenu">Utilities</span>&nbsp;▸
+     <span class="guimenuitem">Disks</span></span>.
+   </div>
+
+   [[!img install/inc/icons/gnome-disks.png link="no" alt=""]]
+
+1. Plug the USB stick in the computer.
+
+   A new drive appears in the left pane. Click on it.
+
+   [[!img install/inc/screenshots/gnome_disks_drive.png link="no" alt=""]]
+
+1. Click on the
+   [[!img lib/open-menu.png alt="Menu" class="symbolic" link="no"]] button in
+   the titlebar and choose
+   <span class="guimenuitem">Restore Disk Image&hellip;</span>.
+
+   [[!img install/inc/screenshots/gnome_disks_menu.png link="no" alt=""]]
+
+   If your version of <span class="application">GNOME Disks</span> is
+   old it might have a
+   [[!img lib/emblem-system.png alt="System" class="symbolic" link="no"]]
+   button instead. Click on the
+   [[!img lib/emblem-system.png alt="System" class="symbolic" link="no"]]
+   button and choose
+   <span class="guimenuitem">Restore Disk Image&hellip;</span>.
+
+   [[!img install/inc/screenshots/gnome_disks_system.png link="no" alt=""]]
+
+   <div class="bug">
+
+   XXX Should below (intermediary Tails instructions) be removed? 
+
+   <p>If your version of <span class="application">GNOME Disks</span> is even
+   older and has neither a
+   [[!img lib/open-menu.png alt="Menu" class="symbolic" link="no"]] nor a
+   [[!img lib/emblem-system.png alt="System" class="symbolic" link="no"]]
+   button, you have to [[!toggle id="dd" text="install an intermediary Tails
+   using the command line"]].</p>
+
+   </div>
+
+   [[!toggleable id="dd" text="""
+
+   Install an intermediary Tails using the command line
+   ----------------------------------------------------
+
+   1. Take note of the *device name* of the first USB stick as displayed in the
+      right pane. The device name should be something like `/dev/sdb`,
+      `/dev/sdc`, etc.
+
+   <div class="caution">
+
+   <p>If you are not sure about the device name, you should stop proceeding or
+   you risk overwriting any hard disk on the computer.</p>
+
+   </div>
+
+   1. Open a terminal.
+
+   1. Execute the following command, replacing `[tails.iso]` with the path to the
+      ISO image that you want to install and `[device]` with the device name
+      found in step 1.
+
+          dd if=[tails.iso] of=[device] bs=16M && sync
+
+      Here is an example of command to execute, yours is probably different:
+
+          dd if='/home/amnesia/tails-2.0.iso' of=/dev/sdc bs=16M && sync
+
+   <div class="tip">
+
+   <p>If you are not sure about the path to the ISO image or if you get a <span
+   class="guilabel">No such file or directory</span> error message, you can
+   first type <code>dd</code>, followed by a space, and then drag and drop the
+   icon of the ISO image from a file browser onto the terminal. Doing so should
+   insert the correct path to the ISO image in the terminal.  Then complete the
+   command and execute it.</p>
+
+   </div>
+
+   1. If no error message is returned, Tails is being install on the USB stick.
+      The installation takes a few minutes.
+
+   You can now continue with the next step and [[Open these instructions on
+   another device|usb#intermediary]].
+
+   """]]
+
+1. In the <span class="guilabel">Restore Disk Image</span> dialog, click on
+   the file selector button and choose the ISO image that you downloaded
+   earlier.
+
+1. Click on the <span class="button">Start Restoring&hellip;</span> button.
+
+1. In the confirmation dialog click <span class="button">Restore</span>. The
+   installation takes a few minutes.
+
+1. After the installation is finished, click on the
+   [[!img lib/media-eject.png alt="Eject" class="symbolic" link="no"]] button.