我正在将 USB 转串行 FTDI 转换器连接到运行原生 Ubuntu 16.04 的笔记本电脑，但我看不到 /dev/ttyUSB* 条目。如果我将其连接到 Windows 主机上运行 Ubuntu 14.04 的 Oracle Virtual Box，它会显示 /dev/ttyUSB*，请帮忙看看原生 Ubuntu 16.04 可能存在什么问题
uname -a
Linux Precision-M4800 4.15.0-33-generic #36~16.04.1-Ubuntu SMP Wed Aug 15 17:21:05 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux
lsb_release -a
LSB Version: core-9.20160110ubuntu0.2-amd64:core-9.20160110ubuntu0.2-noarch:printing-9.20160110ubuntu0.2-amd64:printing-9.20160110ubuntu0.2-noarch:security-9.20160110ubuntu0.2-amd64:security-9.20160110ubuntu0.2-noarch
Distributor ID: Ubuntu
Description: Ubuntu 16.04.3 LTS
Release: 16.04
Codename: xenial
dmesg | tail 输出：
*
[4168693.886387] usb 3-2: New USB device found, idVendor=0403, idProduct=6010
[4168693.886389] usb 3-2: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[4168693.886391] usb 3-2: Product: Dual RS232-HS
[4168693.886392] usb 3-2: Manufacturer: FTDI
[4169130.482430] usb 3-2: USB disconnect, device number 35
[4169134.326181] usb 3-2: new high-speed USB device number 36 using xhci_hcd
[4169134.474575] usb 3-2: New USB device found, idVendor=0403, idProduct=6010
[4169134.474577] usb 3-2: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[4169134.474603] usb 3-2: Product: Dual RS232-HS
[4169134.474605] usb 3-2: Manufacturer: FTDI*
journalctl --follow USB 连接时的输出：
kernel: usb 3-2: new high-speed USB device number 36 using xhci_hcd
kernel: usb 3-2: New USB device found, idVendor=0403, idProduct=6010
kernel: usb 3-2: New USB device strings: Mfr=1, Product=2, SerialNumber=0
kernel: usb 3-2: Product: Dual RS232-HS
kernel: usb 3-2: Manufacturer: FTDI
mtp-probe[25796]: checking bus 3, device 36: "/sys/devices/pci0000:00/0000:00:14.0/usb3/3-2"
mtp-probe[25796]: bus: 3, device: 36 was not an MTP device
**lsmod | grep usb output:**
usb_storage 69632 1 uas
btusb 45056 0
btrtl 16384 1 btusb
btbcm 16384 1 btusb
btintel 16384 1 btusb
bluetooth 557056 31 btrtl,btintel,bnep,btbcm,rfcomm,btusb
树/sys/bus/usb/驱动程序/
├── btusb
│ ├── 2-1.5:1.0 -> ../../../../devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.5/2-1.5:1.0
│ ├── 2-1.5:1.1 -> ../../../../devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.5/2-1.5:1.1
│ ├── bind
│ ├── module -> ../../../../module/btusb
│ ├── new_id
│ ├── remove_id
│ ├── uevent
│ └── unbind
├── hub
│ ├── 1-0:1.0 -> ../../../../devices/pci0000:00/0000:00:1a.0/usb1/1-0:1.0
│ ├── 1-1:1.0 -> ../../../../devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1:1.0
│ ├── 2-0:1.0 -> ../../../../devices/pci0000:00/0000:00:1d.0/usb2/2-0:1.0
│ ├── 2-1:1.0 -> ../../../../devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1:1.0
│ ├── 3-0:1.0 -> ../../../../devices/pci0000:00/0000:00:14.0/usb3/3-0:1.0
│ ├── 4-0:1.0 -> ../../../../devices/pci0000:00/0000:00:14.0/usb4/4-0:1.0
│ ├── bind
│ ├── module -> ../../../../module/usbcore
│ ├── new_id
│ ├── remove_id
│ ├── uevent
│ └── unbind
├── uas
│ ├── bind
│ ├── module -> ../../../../module/uas
│ ├── new_id
│ ├── remove_id
│ ├── uevent
│ └── unbind
├── usb
│ ├── 1-1 -> ../../../../devices/pci0000:00/0000:00:1a.0/usb1/1-1
│ ├── 1-1.5 -> ../../../../devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.5
│ ├── 2-1 -> ../../../../devices/pci0000:00/0000:00:1d.0/usb2/2-1
│ ├── 2-1.5 -> ../../../../devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.5
│ ├── 2-1.8 -> ../../../../devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.8
│ ├── 3-2 -> ../../../../devices/pci0000:00/0000:00:14.0/usb3/3-2
│ ├── bind
│ ├── uevent
│ ├── unbind
│ ├── usb1 -> ../../../../devices/pci0000:00/0000:00:1a.0/usb1
│ ├── usb2 -> ../../../../devices/pci0000:00/0000:00:1d.0/usb2
│ ├── usb3 -> ../../../../devices/pci0000:00/0000:00:14.0/usb3
│ └── usb4 -> ../../../../devices/pci0000:00/0000:00:14.0/usb4
├── usbfs
│ ├── bind
│ ├── module -> ../../../../module/usbcore
│ ├── new_id
│ ├── remove_id
│ ├── uevent
│ └── unbind
├── usb-storage
│ ├── bind
│ ├── module -> ../../../../module/usb_storage
│ ├── new_id
│ ├── remove_id
│ ├── uevent
│ └── unbind
└── uvcvideo
├── 1-1.5:1.0 -> ../../../../devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.5/1-1.5:1.0
├── 1-1.5:1.1 -> ../../../../devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.5/1-1.5:1.1
├── bind
├── module -> ../../../../module/uvcvideo
├── new_id
├── remove_id
├── uevent
└── unbind
33 directories, 33 files
答案1
缺少驱动模块（*.ko），升级 ubuntu 后，它现在可以正常工作了