I’ve tried to run Linux off and on over the years. It’s a kind of geek merit badge, you aren’t a true geek until you can do all of your work in Linux. During my most current trial, I was having trouble with the sound. It worked until I plugged in my headphones and the headphones worked when the machine booted Windows.
I tried all the solutions, including bringing up a terminal and typing all kinds of sudo vodo, but to no avail.
The solution was so simple. Double clicking on the speaker icon, the one near the clock brought up a volume control panel. There is a separate volume control for headphones. They were muted by default.