doc: install in Ubuntu 18.04 and from 18.10

docs/docs/nodes.rst

@@ -220,18 +220,19 @@ TroubleShooting
 
 It means you didn't install libvirt in the node. Fix it this way:
 
+For Ubuntu 18.04:
 
 .. code-block:: bash
 
     root@node:~# apt-get install libvirt-bin
     
-But now, the libvirt-bin package was dropped in release 18.10 Ubuntu. The package was split into two parts:
+From Ubuntu 18.10 instead of libvirt-bin you need install libvirt-daemon-system and libvirt-clients.
 
 .. code-block:: bash
-root@node:~# apt-get install libvirt-daemon-system
-root@node:~# apt-get install libvirt-clients
 
-so instead of libvirt-bin you need install libvirt-daemon-system and libvirt-clients.
+    root@node:~# apt-get install libvirt-daemon-system
+    root@node:~# apt-get install libvirt-clients
+
 
 Balance algorithm
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