Why Turtlebot3_navigation2 launch file different from Github [closed]

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According to http://repo.ros2.org/status_page/ros_... the latest version (as of writing this) is 2.1.0, comparing that with foxy-devel using github I see lots of commits (19 at the moment):

https://github.com/ROBOTIS-GIT/turtle...

Including the commit that changed the line you are referencing:

https://github.com/ROBOTIS-GIT/turtle...

What this means is that they have committed these changes to foxy-devel intending for them to be part of foxy eventually, but they have not done a release for foxy since then and therefore the changes you see on GitHub are not reflected in the latest foxy binaries. If you want to compare what you have from your binary with the source code, use one of these two links:

• 2.1.0 tag on the main repository:
  • https://github.com/ROBOTIS-GIT/turtle...
• or the release repository (used by our build farm to build packages):
  • https://github.com/robotis-ros2-relea...

I recommend the first one, but it's possible there are patches included in the second one that aren't the upsteam source. In this case I still recommend the first link.