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Thanks problem is solved: I have Noetic installed on Ubuntu 20.04 and installed boost libraries from source. I uninstalled ROS and ALL instances of boost via sudo apt autopurge $(dpkg -l | grep boost | grep 1.71 | awk '{print $2}'). Now the roscore starts with no problem. However catkin_make keeps failing because of the following error error: ‘boost::placeholders’ has not been declared

Thanks problem is solved: I have Noetic installed on Ubuntu 20.04 and installed boost libraries from source. I uninstalled ROS and ALL instances of boost via sudo apt autopurge $(dpkg -l | grep boost | grep 1.71 | awk '{print $2}'). Re-installed ROS Noetic only (as it comes with the proper version of boost 1.71). Now the roscore starts with no problem. However catkin_make keeps failing because of the following error error: ‘boost::placeholders’ has not been declared