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I had the same problem with my Kinetic on Ubuntu 16 after a recent upgrade/dist-upgrade. A work around is to rename or move roscore to something else.

sudo cp /opt/ros/$ROS_DISTRO/bin/roscore /opt/ros/$ROS_DISTRO/bin/roscore1

Hope this help until a better solution is found.

I had the same problem with my Kinetic on Ubuntu 16 after a recent upgrade/dist-upgrade. A work around is to rename or move roscore to something else.

sudo cp /opt/ros/$ROS_DISTRO/bin/roscore /opt/ros/$ROS_DISTRO/bin/roscore1

Hope this help until a better solution is found.

Edit 1: I had the issue fixed by reinstalling the rosmaster package.

sudo apt install --reinstall ros-$ROS_DISTRO-rosmaster