> Yes, sound works perfectly in a guest session. That means that the problem is specific to your user's configuration. It sounds like ALSA works, since you got sound when testing your speakers in Sound settings. (I have since learned that a faster way to do this would have been to run "speaker-test" in a terminal.) This leads me to suspect that the problem is with your pulseaudio configuration. What I would do, is run
$ sudo apt purge pulseaudio && sudo apt install pulseaudio The difference between "apt purge" and "apt remove" is that "remove" uninstalls the program but leaves your configuration files, whereas "purge" removes both the program and configuration files. This way, when you reinstall pulseaudio you will get fresh configuration files which should be the same as your Guest user. If this doesn't work, then the configuration problem is with something other than pulseaudio and we'll take it from there. In my experience though, pulseaudio is the most common culprit. Removing pulseaudio entirely would probably fix sound too, but Firefox and Firefox-derivatives like Abrowser and Icecat require pulseaudio for sound, so we're stuck with it. Hopefully returning to the default configuration will be enough.
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