Ubuntu 18.04 iMac 27 Inch No Sound Troubleshooting

Solving

2. 2. Editing Alsa Configuration

   Then simply Edit Alsa Config File
   By the nano CLI Editor with:

   sudo nano /etc/modprobe.d/alsa-base.conf

   And Append:

   options snd-hda-intel model=imac27

   Ctrl+x to Save & Exit from nano Editor :)

3. 3. Rebooting

   Finally, Reboot ;)
   From Terminal play:

   sudo reboot

So Now I’m truly Happy if My Guide could Help you to Solve Ubuntu 18.04 iMac 27 Inch No Sound Issue!