When I setting package Igot error . Error encountered; filesystem operation aborted.

[asps946701]

Hi I first time try to use robot_upstart but get error
Could anyone help me ? Thank!

system information
-melodic
-jetson nano ubuntu 18.04

my command :
1.sudo apt-get install ros-melodic-robot-upstart
2.source .bashrc
3.rosrun robot_upstart install usb_cam/launch/usb_cam-test.launch

Error massage is below
b'/lib/systemd/systemd'
Preparing to install files to the following paths:
/etc/ros/melodic/usb.d/.installed_files
/etc/ros/melodic/usb.d/usb_cam-test.launch
/etc/systemd/system/multi-user.target.wants/usb.service
/lib/systemd/system/usb.service
/usr/sbin/usb-start
/usr/sbin/usb-stop
Now calling: /usr/bin/sudo /opt/ros/melodic/lib/robot_upstart/mutate_files
Traceback (most recent call last):
File "/opt/ros/melodic/lib/robot_upstart/mutate_files", line 37, in
installation_files = pickle.loads(sys.argv[1])
File "/usr/lib/python2.7/pickle.py", line 1388, in loads
return Unpickler(file).load()
File "/usr/lib/python2.7/pickle.py", line 864, in load
dispatchkey
KeyError: '{'
Error encountered; filesystem operation aborted.
** To complete installation please run the following command:
sudo systemctl daemon-reload && sudo systemctl start usb

than using : sudo systemctl daemon-reload && sudo systemctl start usb
Failed to start usb.service: Unit usb.service not found.

[Pran-Seven]

You could modify your service file to look for when USB service starts and then launch, or retry on failure to make sure it keeps trying until usb service is available.
https://superuser.com/questions/1322777/in-systemd-service-file-how-do-i-say-after-usb-is-ready this link might help you setup the service so that you can launch after usb service is ready