Apple tech took control of my iMac & thoroughly checked every setting on my system to make sure Mac OS wasn't blocking anything with the Norton 360 installer then had me try installing Norton 360 again as they guided me through entire install process. Since my iMac is brand new I was able to get Apple's highest tier iMac Tech support to try & help me resolve this Norton 360 install issue. This issue with Norton 360 not working and/or installing on Mac OS Big Sur 11.5.1 is definitely a compatibility issue that Norton Lifelock will have to provide a fix for. I am using Big Sur, latest edition on an iMac 27' (late 2017)ĭespite having been with Norton since the early days when Peter Norton actually ran the company I am ready to chuck it and install Total AV, Intego, Kaspersky or another more reliable app which installs and then sits quietly until there is a problem to solve.

I have completely uninstalled the app using the terminal script provided and then reinstalled - once again all bright and shine and then it falls over. Like the others if I get it working this only lasts part of a day before saying there is an error. Secondly, it asks to Allow Lifelock in General tab under System Preferences. Keeps asking me to update preferences firstly with Norton System Extension in Full Disk Access (its already in there and ticked) but when Complete is touched it takes age to validate and comes up with an error. Norton cant even agree! - the icon in the toolbar has a X in it while the Icon in the Dock has a tick! On my Norton website subscription list it shows 4 devices protected while on my iMac it says three! Go figure. Add me to the list of frustrated Norton 360/Lifelock users! I probably have wasted two days in total trying to solve this.

Uninstall norton 360 on mac