When I try to install Windows system updates, it says my Symantec antivirus must be uninstalled first.
Windows is attempting to install updates that are incompatible with the current antivirus version.
A new version of the antivirus will need to be installed. You can obtain the latest version of Symantec Endpoint Protection from the Software Center.
If you need assistance updating the version of your antivirus, please contact the ITS Service Desk or submit a service request.