Ros2doctor: no definition of [python3-ifcfg] for os version [jammy]

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nearly at the end of ROS install instructions, and I get to this point:

(base) rich@rich-linux:~$ rosdep install --from-paths ~/ros2_galactic/ros2-linux/share --ignore-src -y --skip-keys "cyclonedds fastcdr fastrtps rti-connext-dds-5.3.1 urdfdom_headers" ERROR: the following packages/stacks could not have their rosdep keys resolved to system dependencies: ros2doctor: No definition of [python3-ifcfg] for OS version [jammy]

I am on ubuntu 20.04 installing ros galactic desktop version. python3 is (i believe) installed