I am struggling to get my Logitech C270 webcam to work on Zorin OS 18 (the webcam's microphone works just fine, BTW). I have a Lenovo ThinkCentre M710q. The Camera app just gives me a white screen; so does Zoom.
lsusb confirms the device is present, and ls -ltrh /dv/video* shows both /dev/video1 and /dev/video0 exist. The Logitech web cam is the only camera connected to the PC. I installed ubuntu-restricted-extras when I installed Zorin.
sudo lshw -C video tells me:
description: VGA compatible controller
product: HD Graphics 630
vendor: Intel Corporation
physical id: 2
bus info: pci@0000:00:02.0
logical name: /dev/fb0
version: 04
width: 64 bits
clock: 33MHz
capabilities: pciexpress msi pm vga_controller bus_master cap_list rom fb
configuration: depth=32 driver=i915 latency=0 resolution=1920,1200
resources: irq:135 memory:f6000000-f6ffffff memory:e0000000-efffffff ioport:f000(size=64) memory:c0000-dffff
Although it always seemed to take a few seconds to be recognized, the webcam (and microphone) worked fine in Ubuntu and Windows. It's been awhile since I ran Zorin OS 17, but I believe it worked fine there, too.
Looking forward to hearing your thoughts. Thank you, everyone!
UPDATE: I continued trying to figure out what was going on and, after a few hours, plugged the web cam into another computer. I found the same issues, even on another machine running a different OS (microphone worked, etc.). ... I've now bought a new web came 
Thank you again for your replies.
