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I finally found why the sounds was completely messed up on my laptop. The culprit was: Firejail. Since I uninstalled Firejail the sound is working fine everywhere.
Thank very much for your help MrEen.

Hello MrEen, Sorry to disturb you again... I finally got a response from someone at VB forum. The guy who is trying to help me he/she is not a Linux/Pulse audio guy and could not interpret this: 00:00:44.329493 Audio: Enable stream '[PulseAudio] Front' failed with VERR_INVALID_POINTER 00:00:55.46391...

When everything but VBox is working, shut down the guest OS, go to Settings > Audio and change 'Audio: ICH AC97' to 'Audio: Intel HD Audio' then restart the guest OS. Thanks but I had tried to change that before and it did not work. I tried all different combinations of 'Host audio Driver' and 'Aud...

Thanks Flemur but I had already tried apulse and it did not work... When I launched VB, sounds is working fine in VB but not in SMPlayer, Firefox, etc, and when I run pulseaudio -k then the sound comes back in SMPlayer and Firefox but stops in VB. SMPlayer and VB have always been properly configured...

I think what you need to do is run pulseaudio -k , then launch VB. Yes, if I do that the sound works on VB but the sound is not working on SMPlayer. Then if I run pulseaudio -k again, the sound comes back on SMPlayer but does not work anymore on VB. When VB is running and I use pulseaudio -k then t...

Isn't it strange when I run pulseaudio -k that actually pulseaudio starts working on Firefox and SMPlayer? It should be the opposite... Again I still don't have sound on VirtualBox... I thought that running pulseaudio --start would make the sound comes back on VirtualBox, but it does not... Any othe...

Actually it changes everyday... Today I had sound on VirtualBox, Firefox and SMPlayer... I wonder for how long.
I'll let you know.
I am using W7 Pro on VB 5.2.30

I found something interesting... It's not only when I reboot my computer that pulseaudio turns off by itself. It turns off like that from time to time (I haven't discovered why yet). When pulseaudio is off I have sound on VirtualBox but NOT on Firefox and SMPlayer. When I run pulseaudio -k the sound...

I'm sorry. For KDE users the command should have been kdesudo ... . I've never used KDE and totally forgot about that. That's ok, no worry. Regarding VirtualBox, is vboxusers in the output from running groups $USER in the terminal? Yes, it does appear in the output... But there is no sound on Virtu...

Users of 18.3 and earlier versions of Mint type this in the terminal: gksudo xed /etc/pulse/default.pa Did not do anything. So I opened my file manager in root, found the line and changed it. If still no change, in the terminal enter gksudo xed /etc/modprobe.d/alsa-base.conf then enter your passwor...

Now that pulseaudio has been reinstalled SMPlayer does not work again. I changed the audio settings, I tried pulse, alsa, etc, but nothing works.
Firefox also does not work.

Here you are: I am hearing sound from the Built-in Speakers and sometimes from Headphones.

Here is the link: http://alsa-project.org/db/?f=9f1c8ccb5 ... 887035c1ed

I have to go now so I'll be in touch with you later on.

Yes, but it's an EXTREMELY long text. Shall I paste it here?

I'd suggest reinstalling pulseaudio then run these two commands in the terminal to get a thorough output of your sound system: cd ~/ followed by wget http://www.alsa-project.org/alsa-info.sh -O alsa-info.sh && bash alsa-info.sh Thanks. I did that and the only thing I got was a file named "alsa-info...

Thanks for trying to help me MrEen.

sudo fuser -v /dev/snd/* output is:
USER PID ACCESS COMMAND
/dev/snd/controlC0: oo 1549 F.... kmix

If you have more knowledge with pulseaudio perhaps I should reinstall it and make some more experimentation...

So... I have tried many different possibilities and yet it does not work fully. I installed apulse and tried to make it work with SMPlayer and Firefox but it did not work at all. I uninstalled pulseaudio completely because with it I only had my sounds system working (no sounds on Firefox and no soun...

Thanks for the suggestion Flemur.
I re-installed alsa-utils.
I did not find "apulse" package in the repos...

Hi MrEen, In fact I installed lots of different sound apps, beside alsa and pulseaudio because those two seemed not to work properly. I deleted the files you mentioned but I still have issue. Sometimes it works, sometimes it does not. To get the sound from Youtube on Firefox I need to have pulseaudi...