Webcamfix Dell laptop

Fix webcam problem with Dell laptop.

The webcam of my Dell Latitude laptop suddenly stopped working. If I type lsusb then I can see the webcam. But the device /dev/video0 is not there (not a single /dev/video device is there).

I had kernel 5.4.0-74 running (you can see with uname -srm). I installed 5.4.0-73 (older version) and then the webcam worked.
Installing the old kernel under Mint can be done with the Grub Customizer tool and then choose the preset on the General Settings tab. This has to be done with this tool because under Mint the Grub menu is invisible at startup.

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