When running in a build VM, using the Catkin plugin (although given that Colcon also uses rosdep it should apply there as well), I get this error: Initializing rosdep database... Failed to initialize rosdep: Error initializing rosdep database: ERROR: cannot download default sources list from: https://raw.githubusercontent.com/ros/rosdistro/master/rosdep/sources.list.d/20-default.list Website may be down. This is because it's not finding the SSL .so, because the rosdep environment doesn't properly set LD_LIBRARY_PATH to look inside the rosdep install area. I have no idea why this didn't break before now, but I suspect it's because libssl1.1 was installed on the host for one reason or another.