install_linux_distro.rst: Add install instructons for Ubuntu

This commit is part of the work required to resolve issue #436

doc/source/install_linux_distro.rst

@@ -98,7 +98,32 @@ to get the system requirements for the default plugins installed::
   sudo apt-get install \
       lzip gir1.2-ostree-1.0 git bzr ostree patch python3-arpy python3-gi
 
+Ubuntu
+++++++
+
+Ubuntu 17.10 or higher
+^^^^^^^^^^^^^^^^^^^^^^
+For Ubuntu 17.10 or 18.04, the BuildStram core dependencies can be installed with::
+
+  sudo apt-get install \
+      fuse bubblewrap git python3 python3-pip python3-dev
+
+To install the dependencies for the default plugins::
 
+  sudo apt-get install \
+      lzip git bzr patch python3-arpy ostree gir1.2-ostree-1.0 python3-gi
+
+
+Ubuntu 17.04 and 16.X
+^^^^^^^^^^^^^^^^^^^^^
+On Ubuntu 16.X, neither `bubblewrap<https://github.com/projectatomic/bubblewrap/>` 
+or `ostree<https://github.com/ostreedev/ostree>` are available in the official repositories.
+You will need to install them in whichever way you see fit. Refer the the upstream documentation
+for advice on this.
+
+Bubblewrap is available on Ubuntu 17.04, however as with Ubuntu 16.X Ostree is unsuported by the
+the official repositories and you will need to install it yourself.
+  
 Fedora
 ++++++
 For recent fedora systems, the following line should get you the system
@@ -197,3 +222,4 @@ from `AUR <https://wiki.archlinux.org/index.php/Arch_User_Repository#Installing_
 Alternatively, use
 `buildstream-git <https://aur.archlinux.org/packages/buildstream-git>`_
 for the lastest version of the development branch.
+