Just a quick sanity check at: System -> Preferences -> Personal -> Startup Applications
You can uncheck "Blueman Applet" since you don't need Bluetooth.
Make sure "Volume Control" is checked. I think that's what you're missing.
Logout/in or reboot to see changes.
This may do nothing but worth a first check. I'm running 16.04 in a VM and just saw those 98 updates since yesterday but couldn't reproduce your issue.
Ooops, looks like you solved it. Wanna share what it was?