To clean Network Manager Icon from system tray, and show a working Network Monitor in the tray, do this:

HOW TO CLEAR STATIC NETWORK MANAGER ICON FROM TRAY, and show a working Network Monitor in the tray, do this:

#  Go to System, Preferences, Startup Applications.

#  Go to System, Preferences, Startup Applications.

#  At the General tab, use the drop down list and choose eth0, hit Close.

#  At the General tab, use the drop down list and choose eth0, hit Close.