I can't hear ANY sounds whether I try to listen to music, movies, or YouTube.
My headphones are okay with Windows so please help me troubleshoot my Ubuntu set-up.
Do you see that sound icon at the top right-hand corner of the screen? Click on it, and at the bottom of the menu that drops down, there's one labeled "Sound Settings..." Click on it. Check how many devices there are on the "Output" tab. See if changing devices helps.
If it does, congratulations, if it doesn't, change back to the original one, and keep reading.
On the "Mode" settings, there is a dropdown menu for different profiles for the selected current device. Choose another profile (e..g "Ananlog Stereo Output") until you can hear the sound appropriately on the "Test Speakers" button below that.
Remember that there's no need to click "Apply" or "OK" in Ubuntu. As soon as you change something, it's applied.
If you still hear no sound you may need to install and run pavucontrol for more options on output profiles:
If there still is no sound you may need to run