Ubuntu Desktop. Solving the problem with sound

If you have trouble with sound like this. Sometimes it might disappear or appear by itself. Тhen you can apply bellow recipe.

1. Open conf file:

nano /etc/pulse/daemon.conf

2. Find option realtime-scheduling, change option value from yes to no
and uncomment it:

..
; high-priority = yes
; nice-level = -11

realtime-scheduling = no
; realtime-priority = 5

; exit-idle-time = 20
; scache-idle-time = 20
... 

3. Then restart PulseAudio:

pulseaudio -k