usb digital microscope

I suggest that you just try to connect the microscope to the Ubuntu system and check what king of log messages you get.

Just plug it in, wait half a minute and then execute the commands (in a terminal window):

uname -a
lsb_release -crid
dmesg | tail
lsusb

What output do you receive?

Distributor ID: Ubuntu
Description: Ubuntu 16.04.5 LTS
Release: 16.04
Codename: xenial
simon@simon-Compaq-Presario-CQ60-Notebook-PC:~$ dmesg | tail
[41059.009289] usb 2-3: New USB device found, idVendor=1e4e, idProduct=0102
[41059.009294] usb 2-3: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[41059.009297] usb 2-3: Product: HCAM01300KPA
[41059.009301] usb 2-3: Manufacturer: Etron Technology, Inc.
[41059.060316] uvcvideo: Found UVC 1.00 device HCAM01300KPA (1e4e:0102)
[41059.130772] uvcvideo 2-3:1.0: Entity type for entity Extension 4 was not initialized!
[41059.130779] uvcvideo 2-3:1.0: Entity type for entity Processing 3 was not initialized!
[41059.130784] uvcvideo 2-3:1.0: Entity type for entity Camera 1 was not initialized!
[41059.131201] input: HCAM01300KPA: HCAM01300KPA as /devices/pci0000:00/0000:00:1d.7/usb2/2-3/2-3:1.0/input/input35
[41059.425673] uvcvideo: Failed to query (GET_DEF) UVC control 8 on unit 3: -32 (exp. 2).
simon@simon-Compaq-Presario-CQ60-Notebook-PC:~$ lsusb
Bus 002 Device 005: ID 1e4e:0102 Cubeternet GL-UPC822 UVC WebCam
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 008 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 007 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 006 Device 002: ID 045e:07b2 Microsoft Corp.
Bus 006 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 001 Device 003: ID 04f2:b091 Chicony Electronics Co., Ltd Webcam
Bus 001 Device 002: ID 0bda:0158 Realtek Semiconductor Corp. USB 2.0 multicard reader
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
simon@simon-Compaq-Presario-CQ60-Notebook-PC:~$ ^C

http://www.touptek.com/product/showproduct.php?lang=en&id=207

"Built-in 0.35MP, 1.3MP or 2MP digital camera for capturing images and videos"

Like many slide copiers it seems to be a digital camera at its heart. Try something like "Cheese" or another app for showing the output of a digital camera.

The system log shows that the device is recognized, and it should be possible to access it like a webcam.

Try using it with programs like cheese (as already told by arochester).

If this does not work, you might have to install additional packages, maybe uvcdynctrl and v4l-utils

What does the command
v4l2-ctl --list-devices
show (with the package v4l-utils installed)?

simon@simon-Compaq-Presario-CQ60-Notebook-PC:~$ v4l2-ctl --list-devices
CNF7047: HP Webcam-101 (usb-0000:00:1a.7-5):
 /dev/video0

HCAM01300KPA: HCAM01300KPA (usb-0000:00:1d.7-3):
 /dev/video1

simon@simon-Compaq-Presario-CQ60-Notebook-PC:~$

I tried Cheese and guvcview-brlin but the built-in webcam is used. At some stage the system crashed and I had to reboot.

When using the microscope in windows using Amcap, the program allows a choice of webcams. How is this handled by Cheese?

The previous message gave me "This solved my problem" as the only option. It has not been resolved.

In the "Preferences" dialogue of cheese you should be able to select the device.
https://help.gnome.org/users/cheese/2.32/setting-up.html.en

Eventually you could try adding the other device as parameter when starting cheese, something like
cheese -d /dev/video1

Sorry for being ignorant. The Cheese version I installed does not look like the one in help.gnome.org
 I used "Ubuntu Software" and bt searching "Cheese" it presents guvcview-brlin.
Is there another way of installing "Cheese"?

In a Terminal input: sudo apt install cheese

When you have it click on the word Cheese on the top left. Choose Preferences.

This is what happens when doing
simon@simon-Compaq-Presario-CQ60-Notebook-PC:~$ cheese -d /dev/video1
Segmentation fault (core dumped)

There are several different programs for display and recording from webcams and similar devices, see e.g. https://help.ubuntu.com/community/Webcam

Does one of the following commands work:

cheese
cheese -d /dev/video1
guvcview
guvcview -d /dev/video1

guvcview-brlin is no official Ubuntu-provided software.
See https://snapcraft.io/guvcview-brlin for some caveats.

Problem solved. Re-installed Cheese and followed instructions arochester's instructions.
Thank you Manfred and arochester for your excellent advice.