title: Could NOT find Protobuf (missing: Protobuf_INCLUDE_DIR)
body: <p>I am trying to <code>catkin_make</code> in my catkin workspace, but I get the following error</p>
  <blockquote>
  <p>CMake Deprecation Warning at gazebo_ros_demos/gazebo_tutorials/CMakeLists.txt:1
  (cmake_minimum_required):   Compatibility with CMake &lt; 2.8.12 will be
  removed from a future version of   CMake.</p>
  <p>Update the VERSION argument  value or use a ... suffix to
  tell   CMake that the project does not need compatibility with older
  versions.</p>
  <p>-- Using these message generators: gencpp;geneus;genlisp;gennodejs;genpy
  -- Found Boost: /usr/include (found suitable version &quot;1.58.0&quot;, minimum required is &quot;1.40.0&quot;) found components: thread signals system
  filesystem program_options regex iostreams date_time chrono atomic
  CMake Error at
  /usr/share/cmake-3.20/Modules/FindPackageHandleStandardArgs.cmake:230
  (message):   Could NOT find Protobuf (missing: Protobuf_INCLUDE_DIR)
  Call Stack (most recent call first):<br />
  /usr/share/cmake-3.20/Modules/FindPackageHandleStandardArgs.cmake:594
  (_FPHSA_FAILURE_MESSAGE)<br />
  /usr/share/cmake-3.20/Modules/FindProtobuf.cmake:646
  (FIND_PACKAGE_HANDLE_STANDARD_ARGS)<br />
  /usr/lib/x86_64-linux-gnu/cmake/gazebo/gazebo-config.cmake:114
  (FIND_PACKAGE)   gazebo_ros_demos/gazebo_tutorials/CMakeLists.txt:11
  (find_package)</p>
  <p>-- Configuring incomplete, errors occurred! See also &quot;/home/ashwin/catkin_ws/build/CMakeFiles/CMakeOutput.log&quot;. See also
  &quot;/home/ashwin/catkin_ws/build/CMakeFiles/CMakeError.log&quot;.
  Makefile:5582: recipe for target 'cmake_check_build_system' failed
  make: *** [cmake_check_build_system] Error 1 Invoking &quot;make
  cmake_check_build_system&quot; failed</p>
  </blockquote>
  <p>This issue came up when I tried to update my cmake to 3.20. I am fairly new to Ubuntu. Would appreciate any help.</p>