Recommend get on the IRC or whatever the most direct chat forum is for linux mint itself know there are lots of users someone can help you debug live most likely. Can look into: alsamixer, aplay/arecord (usually in alsa-utils package, apt install alsa-utils), pavucontrol for pulseaudio which works above alsamixer. If output or input is muted at alsamixer then doesn't make it to pulse audio. Also check out lsusb and lspci -k terminal commands for listing connected device info should see the devices there.Created a Live LinuxMint USB and running it on my Windows 10 computer.
I am posting this from Linux using FireFox which is the default browser.
So far, I have one problem........ No sound. The Sound icon at system tray says 100%, but no sound when I tried to play music from You-Tube.
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