catkin_lint - Note that the default rosdep is python3 but the default catkin_lint is python2. This typically induces a pickle error (fixed upstream, should be in the next release). Using matching python versions explicitly works.
We have some decent karma on this update, and the new update is only a firmware bugfix release, so I'm not inclined to delay this one any longer. I'll make another release. This one is ready to go, though.