mavlink_sitl_gazebo和px4找不到，但是bashrc里路径都是按照教程写好的

[tiamoaa99-crypto]

求助各位大佬XTDrone的环境配置，我是小菜菜，已经被卡很久了o(╥﹏╥)o
mt@Legion:~$ roslaunch px4 outdoor1.launch
... logging to /home/mt/.ros/log/cb18ca9a-efa2-11f0-aa4f-e7d1c6952dc3/roslaunch-Legion-163520.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.

Resource not found: The following package was not found in : mavlink_sitl_gazebo
ROS path [0]=/opt/ros/noetic/share/ros
ROS path [1]=/home/mt/catkin_ws/src
ROS path [2]=/opt/ros/noetic/share
ROS path [3]=/home/mt/PX4_Firmware/Tools/simulation/gazebo-classic/sitl_gazebo-classic
ROS path [4]=/home/mt/PX4_Firmware
The traceback for the exception was written to the log file
以及我bashrc中的最后几行：
source /opt/ros/noetic/setup.bash
source ~/catkin_ws/devel/setup.bash
source ~/PX4_Firmware/Tools/setup_gazebo.bash /PX4_Firmware /PX4_Firmware/build/px4_sitl_default
export ROS_PACKAGE_PATH=$ROS_PACKAGE_PATH:/PX4_Firmware/Tools/simulation/gazebo-classic/sitl_gazebo-classic
export ROS_PACKAGE_PATH=$ROS_PACKAGE_PATH:/PX4_Firmware