Point to local (if running from within the xserver directory). Add us…

…age to readme.

xserver/README.md

@@ -3,7 +3,19 @@ This directory contains code that runs an Xorg X server that does not do anythin
 
 This is necessary when running on a remote server that does not have a display or X server.
 
-Requirements:
-* Xorg install -- 'sudo apt install xorg-server'
+### Requirements ### 
+
+* Xorg install -- 'sudo apt install xserver-xorg'
 * lspci -- Part of PCI tools, which determine what is in the PCI (Peripheral 
-Component Interconnect) buses.  'sudo apt install pcitools'
+Component Interconnect) buses.  'sudo apt install pciutils'
+
+### Usage ###
+
+<pre>
+% cd xserver
+% sudo python3 run_startx & 
+</pre>
+
+Sudo is necessary since the X server needs to be running as root.  The & is so 
+the X server continues to run.  
+

xserver/run_startx.py

@@ -4,11 +4,11 @@
 #
 #
 import time
-
-from .x_server import startx
+from x_server import startx
 
 # This uses code from AI2THOR Docker that creates a xorg.conf based on the
 # current GPU and then starts a headless Xorg in a new thread.
+
 startx()
 
 print(" Now going to sleep", flush=True)