Kill process that raises Device or resource busy: '/dev/ttyUSB0'?
You can use
$ fuser /dev/ttyUSB0to list the PIDs of the processes using the file. Alternatively, if your fuser command supports it you can use the -k option to kill them.
In my case
$ fuser /dev/ttyUSB0was not working (it showed nothing).
What was working, however, was the following:
$ sudo lsof /dev/ttyUSB0This gave me a list of the processes that were using my serial port and I could simply kill them using the PID (corresponding to the second column in the list).
Run:
$ ps ax
You will see what process is using serial port. Kill that process. This solved it for me.