2301_82111796: 按照步骤安装好之后，roscore打不开 $ roscore Traceback (most recent call last): File "/usr/bin/roscore", line 37, in from roslaunch.nodeprocess import DEFAULT_TIMEOUT_SIGINT, DEFAULT_TIMEOUT_SIGTERM File "/usr/lib/python3/dist-packages/roslaunch/__init__.py", line 62, in from .scriptapi import ROSLaunch File "/usr/lib/python3/dist-packages/roslaunch/scriptapi.py", line 42, in import roslaunch.parent File "/usr/lib/python3/dist-packages/roslaunch/parent.py", line 54, in import roslaunch.server File "/usr/lib/python3/dist-packages/roslaunch/server.py", line 80, in from rosgraph_msgs.msg import Log ImportError: cannot import name 'Log' from 'rosgraph_msgs.msg' (/opt/ros/humble/local/lib/python3.10/dist-packages/rosgraph_msgs/msg/__init__.py)