Ubuntu uses Bluetooth and minicom

Ubuntu itself generally has a USB-to-serial driver.

1. First confirm that the system supports usbserial, enter the following command:     lsmod | grep Usbserial2. Connect the USB serial cable to see if the system can be identified. Enter the following command:     DMESG | grep ttyusb      or go directly to/dev to see if there are ttyUSB0 or ttyUSB13. Minicom, equivalent to a HyperTerminal under Windows.      sudo apt-get install MINICOM4. Configure Minicom. In general, use mincom     minicom-s    for minicom configuration with root permissions. +-----[Configuration]------+            | Filenames and Paths      |            | File transfer Protocols  |            | Serial Port Setup        |            | Modem and dialing        |            | Screen and keyboard      |            | Save Setup as DFL        |            | Save setup as.          |  &nbsp         | Exit                     |            | Exit from Minicom      select  serial Port Setup, it will appear:  a-   serial Device     &NBS P:/dev/ttyusb1                              |     | B-lockfile location    :/var/lock                     &NBS P           |    | C-  Callin program     &NBSP:                     &NBS P                     |    | D- callout program     &NBSP:                     &NBS P                    |    | E-   bps/par/bits      : 9600 8N1                 &NBS P                |    | F-hardware Flow control:no                                      |    | G-software Flow control:no                                      |    |                          ,         &NB Sp                          ,         |&N Bsp   |    change which setting?   My own computer is ttyUSB1, which needs to be noted here is the BPS and flow control configuration. BPS is generally 9600, flow control all select No. Then  save setup as dfl  so it's done!   then input sudo Minicom will be able to connect the switch normally!

Ubuntu uses Bluetooth and minicom