So, suddenly my system has no sound, on Settings -> Audio there's only one option: Dummy Output.

I tried alsamixer but it gives an error:

cannot open mixer: No such file or directory

There's no alsa-base.conf file in /etc/modeprobe.d.

Pavucontrol doesn't recognize any cards.

If I run pulseaudio it gives

E: [pulseaudio] pid.c: Daemon already running.
E: [pulseaudio] main.c: pa_pid_file_create() failed.

Any suggestions? This is my first post, so sorry if it's confusing.

  • My Ubuntu machine does that too sometimes. Usually, when I reboot the machine, the problem is fixed. Do try it and see if your problem was fixed.
    – jindan
    Mar 20, 2020 at 14:00
  • Actually, just rebooted and nothing happened. Mar 20, 2020 at 14:05

1 Answer 1


I'm having the same problem with Ubuntu 18.04 LTS I've tried the kernel 5.3.28 in Grub (Advanced options to Ubuntu) and the sound works. The problem is in kernel 5.3.42.

  • I'll give it a try. Thanks! Mar 20, 2020 at 14:06
  • You're welcome. I hope that Ubuntu fixed this, I've tried kernel 5.4 and 5.5 and doesn't work. Mar 20, 2020 at 18:09
  • I tried this and it does not work. After logging in when using kernel 5.3.28 or 5.3.40 the computer freezes.
    – Kostas
    Jun 18, 2020 at 16:04

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