Comment 13 for bug 1599599

Well the beep is back, for now. I noticed it working today and possibly was due to yesterday's updates (I'll attached a file called "updates_term_log.txt").
This could be one of those one time only scenarios, so I'll wait until after a few system restarts and report back.

Here is the output for yesterday's updates from /var/log/apt/history.log :

Start-Date: 2016-07-19 05:59:00
Commandline: aptdaemon role='role-commit-packages' sender=':1.113'
Upgrade: libunity-settings-daemon1:amd64 (15.04.1+16.04.20160209-0ubuntu2, 15.04.1+16.04.20160701-0ubuntu1), libnm-glib4:amd64 (1.2.0-0ubuntu0.16.04.2, 1.2.0-0ubuntu0.16.04.3), gstreamer1.0-plugins-ugly-amr:amd64 (1.8.1-1ubuntu0.1, 1.8.2-1ubuntu0.1), unity-schemas:amd64 (7.4.0+16.04.20160526.1-0ubuntu1, 7.4.0+16.04.20160715-0ubuntu1), update-notifier-common:amd64 (3.168, 3.168.1), binutils:amd64 (2.26.1-1ubuntu1~16.04, 2.26.1-1ubuntu1~16.04.1), unity-lens-applications:amd64 (7.1.0+16.04.20160217.2-0ubuntu1, 7.1.0+16.04.20160701-0ubuntu1), libnm-glib-vpn1:amd64 (1.2.0-0ubuntu0.16.04.2, 1.2.0-0ubuntu0.16.04.3), libnm0:amd64 (1.2.0-0ubuntu0.16.04.2, 1.2.0-0ubuntu0.16.04.3), unity:amd64 (7.4.0+16.04.20160526.1-0ubuntu1, 7.4.0+16.04.20160715-0ubuntu1), network-manager:amd64 (1.2.0-0ubuntu0.16.04.2, 1.2.0-0ubuntu0.16.04.3), thunderbird-gnome-support:amd64 (1:38.8.0+build1-0ubuntu0.16.04.1, 1:45.2.0+build1-0ubuntu0.16.04.1), libnm-util2:amd64 (1.2.0-0ubuntu0.16.04.2, 1.2.0-0ubuntu0.16.04.3), metacity-common:amd64 (1:3.18.4-0ubuntu0.3, 1:3.18.5-0ubuntu0.1), thunderbird-locale-en-us:amd64 (1:38.8.0+build1-0ubuntu0.16.04.1, 1:45.2.0+build1-0ubuntu0.16.04.1), unity-services:amd64 (7.4.0+16.04.20160526.1-0ubuntu1, 7.4.0+16.04.20160715-0ubuntu1), libunity-core-6.0-9:amd64 (7.4.0+16.04.20160526.1-0ubuntu1, 7.4.0+16.04.20160715-0ubuntu1), libmetacity-private3a:amd64 (1:3.18.4-0ubuntu0.3, 1:3.18.5-0ubuntu0.1), thunderbird:amd64 (1:38.8.0+build1-0ubuntu0.16.04.1, 1:45.2.0+build1-0ubuntu0.16.04.1), unity-settings-daemon:amd64 (15.04.1+16.04.20160209-0ubuntu2, 15.04.1+16.04.20160701-0ubuntu1), thunderbird-locale-en:amd64 (1:38.8.0+build1-0ubuntu0.16.04.1, 1:45.2.0+build1-0ubuntu0.16.04.1), update-notifier:amd64 (3.168, 3.168.1), base-files:amd64 (9.4ubuntu4.1, 9.4ubuntu4.2), gstreamer1.0-plugins-ugly:amd64 (1.8.1-1ubuntu0.1, 1.8.2-1ubuntu0.1)
End-Date: 2016-07-19 06:00:22