Hello. I am an old retired guy trying to learn ROS. I recently tried to install ROS Lunar Desktop version on my Raspberry Pi 3 running Raspbian Stretch (2018-03-13). Mainly, I followed this website instructions as well as ROS.org lunar/installation/Source. The install instructions are lengthy and will not format nicely so I have removed them. It is my hope that someone can figure out what is wrong from the results of my first test - to run turtlesim. Any help would be greatly appreciated. Below is a copied screen shot of the failure. Also, the contents of the package.xml file referred to is listed next.

pi@pibot:~ $ source /opt/ros/lunar/setup.bash
pi@pibot:~ $ rosrun turtlesim turtlesim_node
terminate called after throwing an instance of 'rospack::Exception'
  what():  error parsing manifest of package ros_core at /opt/ros/lunar/share/ros_core/package.xml
find: ‘’: No such file or directory
libEGL warning: DRI2: failed to authenticate

** (turtlesim_node:1369): WARNING **: Error retrieving accessibility bus address: org.freedesktop.DBus.Error.ServiceUnknown: The name org.a11y.Bus was not provided by any .service files
[ INFO] [1523302539.662260695]: Starting turtlesim with node name /turtlesim
[ INFO] [1523302539.703341492]: Spawning turtle [turtle1] at x=[inf], y=[inf], theta=[0.000000]

PACKAGE.XML FILE:

<?xml version="1.0"?>
<?xml-model
  href="http://download.ros.org/schema/package_format2.xsd"
  schematypens="http://www.w3.org/2001/XMLSchema"?>
<package format="2">
  <name>ros_core</name>
  <version>1.3.2</version>
  <description>A metapackage to aggregate the packages required to use publish / subscribe, services, launch files, and other core ROS concepts.</description>
  <maintainer email="mikael@osrfoundation.org">Mikael Arguedas</maintainer>
  <license>BSD</license>

  <url type="repository">https://github.com/ros/metapackages</url>
  <url type="bugtracker">https://github.com/ros/metapackages/issues</url>

  <author>Dirk Thomas</author>

  <buildtool_depend>catkin</buildtool_depend>

  <exec_depend>catkin</exec_depend>
  <exec_depend>cmake_modules</exec_depend>
  <exec_depend>common_msgs</exec_depend>
  <exec_depend>gencpp</exec_depend>
  <exec_depend>geneus</exec_depend>
  <exec_depend>genlisp</exec_depend>
  <exec_depend>genmsg</exec_depend>
  <exec_depend>gennodejs</exec_depend>
  <exec_depend>genpy</exec_depend>
  <exec_depend>message_generation</exec_depend>
  <exec_depend>message_runtime</exec_depend>
  <exec_depend>ros</exec_depend>
  <exec_depend>ros_comm</exec_depend>
  <exec_depend>rosbag_migration_rule</exec_depend>
  <exec_depend>rosconsole_bridge</exec_depend>
  <exec_depend>roscpp_core</exec_depend>
  <exec_depend>rosgraph_msgs</exec_depend>
  <exec_depend>roslisp</exec_depend>
  <exec_depend>rospack</exec_depend>
  <exec_depend>std_msgs</exec_depend>
  <exec_depend>std_srvs</exec_depend>

  <export>
    <metapackage/>
  </export>
</package>

---

Edit:

What a mess. I did the find to see what files might need to be symlinked. Got the following:

pi@pibot:~ $ sudo find / -name libEGL* -type f
/usr/lib/arm-linux-gnueabihf/libEGL.so.1.0.0
/usr/lib/chromium-browser/libEGL.so
find: ‘/run/user/1000/gvfs’: Permission denied
/opt/vc/lib/libEGL_static.a

Similar result with libGLESv2*. I would assume an *.a file should not be symlinked (only *.so files). Thus, there appears to be nothing to symlink. Sorry Askbot runs all the lines together. I think I have about had it trying to learn ROS. The Gods have forsaken me. Thanks much for all help.