HELP:
问题：roscore报错：
... logging to /home/nuc/.ros/log/d5a6d328-d4ad-11ef-8b12-d1928152a029/roslaunch-nuc-BQM5-36720.log
Checking log directory for disk usage. This may take a while.
Press Ctrl-C to interrupt
Done checking log file disk usage. Usage is <1GB.
RLException: Unable to contact my own server at [http://192.168.31.213:44895/].
This usually means that the network is not configured properly.
A common cause is that the machine cannot connect to itself. Please check
for errors by running:
ping 192.168.31.213
For more tips, please see
http://wiki.ros.org/ROS/NetworkSetup
The traceback for the exception was written to the log file
描述：本来有一个foxy版本ROS，后来又一键安装了一个noetic的版本，然后在网上搜索后把foxy版本的删除了，现在又通过一键安装下载回来了现在每次打开终端之后，会先有这个询问：ros:foxy(1) noetic(2) ?
我输入 2 换行后，输入roscore，出现上述问题。
