how to install ikfast on noetic
Why is there no installation tutorial for Ikfast based on noetic version? At the same time, many of ikfast's dependencies and library features are gone. Has anyone successfully installed ikfast kinematics on Ubuntu20.04 and noetic versions
mostly because "the community" has migrated to use a Docker image instead. Building IKFast is troublesome, on whichever OS, not just Ubuntu Focal.
Refer to the IKFast Kinematics Solver for information on the approach (note: I do not write here: follow all of these steps blindly).
what do you mean exactly by this? IKFast was never a part of ROS, it's a stand-alone project, of which parts were used to generate an IK solver as a MoveIt plugin. That should still work.