No Sound (Dummy Output) error Ubuntu 19.10

Adding to Andrea Pavan's answer:

You can first add the variable to a new boot session and check if it works

1. Reboot your system. AT GRUB, choose Ubuntu and press E. You will be taken to command line options.

2. Locate the line beginning with Linux. Add the following parameter at the end of the line snd_hda_intel.dmic_detect=0

3. Press F10 to reboot.

After verifying this has indeed solved your sound issue, you can make this change permanently by performing the below steps

1. Run sudo gedit /etc/default/grub from terminal.

2. Locate the line beginning with GRUB_CMDLINE_LINUX_DEFAULT and append the above parameter to it. GRUB_CMDLINE_LINUX_DEFAULT="quiet splash snd_hda_intel.dmic_detect=0"

3. Save and Close gedit.

4. Run sudo grub-mkconfig -o /boot/grub/grub.cfg

5. Reboot.

When I was stuck with the same issue, the below link helped me resolve it.

https://superuser.com/questions/1509312/sound-stopped-working-after-upgrading-to-linux-5-4-intel-hd-audio?newreg=2fc5756bbf694e12b60ef3601f2e2411

For > 5.3.0-40 kernels, try adding:

"options snd-hda-intel dmic_detect=0" in the /etc/modprobe.d/alsa-base.conf.

and finally reboot the system. This worked for me!