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.
Now, the Ubuntu forums have a Comprehensive Sound Problem Solutions Guide and this Google search shows that it’s a fairly common problem.
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.

Are you kidding me ? This isn’t a real issue ! Plus, the SAME goes for Windows !
If I ever catch you spoiling Google’s results, I swear to god I WILL CAPS LOCK YOU TO DEATH !