<pre>
sudo nano /boot/config.txt
#Remove the line or add the '#' at the begin of this line;
#dtparam=audio=on
#Add the following line at the end of config.txt file;
dtoverlay=hifiberry-dac
#Save config.txt file(Ctrl-x then Y)#Reboot your Raspberry Pi, then reboot raspberry pi
sudo reboot
</pre>