Fixing Disappearing Network Manager from LMDE after Update Pack 8

One of the issues I witnessed on one of my Linux Mint Debian Edition (LMDE) system, after performing Update Pack 8 was that the network icon

would disappear from the notification bar.  This would make it extremely difficult to manually switch between access points (automatic was fine and transparent, such as if you need to connect to a new access point, or select a particular hot spot among multiple known/saved access points.

The notification icon is actually a program called nm-applet.

When I started it manually, it would exit with the following error:

** (nm-applet:27520): WARNING **: Could not initialize NMClient /org/freedesktop/NetworkManager: Rejected send message, 2 matched rules; type="method_call", sender=":1.92" (uid=1000 pid=27520 comm="nm-applet ") interface="org.freedesktop.DBus.Properties" member="GetAll" error name="(unset)" requested_reply="0" destination="org.freedesktop.NetworkManager" (uid=0 pid=4075 comm="/usr/sbin/NetworkManager ")
** Message: applet now removed from the notification area
** Message: applet now embedded in the notification area
** Message: applet now removed from the notification area

The issue is that /etc/dbus-1/system.d/org.freedesktop.NetworkManager.conf gets reset with Update Pack 8.

To resolve the issue, make a backup of the file /etc/dbus-1/system.d/org.freedesktop.NetworkManager.conf  and modify the file by replacing all of the deny entries with allow.  Easiest way is to open vi, and enter :%s/deny/allow  to automatically switch all the occurrences.  Next time you reboot, nm-applet will stay alive.  You'll also be able to manually start nm-applet in the meanwhile.