After some research, it seems the webcams depend on a new intel driver which 
will be released in kernel 4.16:
https://www.mail-archive.com/linux-media@vger.kernel.org/msg122619.html

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https://bugs.launchpad.net/bugs/1737536

Title:
  Webcams not working on a Dell Latitude 5285 laptop

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  I installed ubuntu 17.10 on a Dell latitude 5285 detachable laptop.
  Unfortunately, the webcams (both rear and front) do not work.
  There is no /dev/video* file.
  I tried upgrading the kernel to version 4.14 and 4.15rc3, but the problem is 
still there.
  Below are my lsusb and lspci outputs.

  $ lspci
  00:00.0 Host bridge: Intel Corporation Xeon E3-1200 v6/7th Gen Core Processor 
Host Bridge/DRAM Registers (rev 02)
  00:02.0 VGA compatible controller: Intel Corporation HD Graphics 620 (rev 02)
  00:04.0 Signal processing controller: Intel Corporation Skylake Processor 
Thermal Subsystem (rev 02)
  00:05.0 Multimedia controller: Intel Corporation Skylake Imaging Unit (rev 01)
  00:13.0 Non-VGA unclassified device: Intel Corporation Device 9d35 (rev 21)
  00:14.0 USB controller: Intel Corporation Sunrise Point-LP USB 3.0 xHCI 
Controller (rev 21)
  00:14.2 Signal processing controller: Intel Corporation Sunrise Point-LP 
Thermal subsystem (rev 21)
  00:14.3 Multimedia controller: Intel Corporation Device 9d32 (rev 01)
  00:15.0 Signal processing controller: Intel Corporation Sunrise Point-LP 
Serial IO I2C Controller #0 (rev 21)
  00:15.1 Signal processing controller: Intel Corporation Sunrise Point-LP 
Serial IO I2C Controller #1 (rev 21)
  00:15.2 Signal processing controller: Intel Corporation Sunrise Point-LP 
Serial IO I2C Controller #2 (rev 21)
  00:16.0 Communication controller: Intel Corporation Sunrise Point-LP CSME 
HECI #1 (rev 21)
  00:1c.0 PCI bridge: Intel Corporation Sunrise Point-LP PCI Express Root Port 
#5 (rev f1)
  00:1c.7 PCI bridge: Intel Corporation Sunrise Point-LP PCI Express Root Port 
#8 (rev f1)
  00:1d.0 PCI bridge: Intel Corporation Sunrise Point-LP PCI Express Root Port 
#9 (rev f1)
  00:1f.0 ISA bridge: Intel Corporation Device 9d4e (rev 21)
  00:1f.2 Memory controller: Intel Corporation Sunrise Point-LP PMC (rev 21)
  00:1f.3 Audio device: Intel Corporation Device 9d71 (rev 21)
  00:1f.4 SMBus: Intel Corporation Sunrise Point-LP SMBus (rev 21)
  01:00.0 Non-Volatile memory controller: Toshiba America Info Systems Device 
0116
  02:00.0 Network controller: Intel Corporation Wireless 8265 / 8275 (rev 78)
  03:00.0 Unassigned class [ff00]: Realtek Semiconductor Co., Ltd. RTS525A PCI 
Express Card Reader (rev 01)

  $ lsusb
  Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
  Bus 001 Device 003: ID 8087:0a2b Intel Corp.
  Bus 001 Device 004: ID 044e:1218 Alps Electric Co., Ltd
  Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

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