Question: This is a bit mysterious problem.

I upgraded Ubuntu 14.04 to 16.04. Now after each reboot the sound volume resets to 100%.

It is mysterious because it happens only on one computer, on another the sound volume is saved OK.

The other mystery is that I have Ubuntu 14.04 and 16.04 on the same computer with the common `/home`. On Ubuntu 14.04 the sound is aved OK, but on 16.04 it does not.

What can I do to troubleshoot this issue?

Answer: 
Disable the "Keep Settings" in the PulseAudio Equalizer.
To fix this problem open Terminal using (Ctrl+Alt+T) and type the below:

```
amixer -D pulse sset Master toggle

```

If you want to change it to a particular percentage type below replacing 50% for your desired volume:

```
amixer -D pulse sset Master 50%

```

Any problems, let me know. :)