1, you need to determine the serial number of the permission to be changed. In Ubuntu system, serial devices appear in the form of, serial devices are connected through USB, so the device names start with dev and ttyUSB, and the device names start with dev and tty. If you are not sure about the serial number of the right you want to change, you can find the connection by running the command lsdev.

2. Determine the serial number of the permission to be changed. The next step is to change the permissions of the serial number. To change the permissions of serial numbers, you need to use the chmod command, which is a command to change the permissions of files and directories.