Fedi, I have more tech troubles. This time it's my laptop's built-in camera. When I join any sort of video meeting (including, at least, Zoom, Teams, and Matrix video rooms), the software detects my camera and claims my camera is on, but the camera shows only a blank black screen. It was working fine until last week and I have no idea what changed.
EDIT: SOLVED by @oblomov@sociale.network
My laptop has a small plastic "privacy shutter" which slides over the webcam. It is the same color as the case so I didn't even see it, but I must have slid it accidentally.
More details here:
https://forums.linuxmint.com/viewtopic.php?t=436324
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