mavros连接测试报错

可人儿

在ubuntu上使用源码安装方式安装了mavros，准备先用PC当作机载电脑对mavros连接进行测试，将电脑通过usb线插入pixhawk侧面的micro-usb口，输入命令roslaunch mavros px4.launch fcu_url:=/dev/ttyACM0，但报错如下信息，有大佬知道是什么原因吗，网上又看到说什么是正常的因为硬件没链接（不太懂什么意思）：
[FATAL] [1723014506.776943797]: FCU: DeviceError:serial:open: No such file or directory
================================================================================REQUIRED process [mavros-2] has died!
process has finished cleanly
log file: /home/amov/.ros/log/d7327a32-548b-11ef-930f-000c296c820d/mavros-2*.log
Initiating shutdown!
================================================================================
[mavros-2] killing on exit
[rosout-1] killing on exit
[master] killing on exit
shutting down processing monitor...
... shutting down processing monitor complete
done

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风帆

/dev/ttyACM0  你要去在Ubuntu下找这个口，是否真实插上了，并且操作系统中是这个文件。类似Windows下的设备端口号