You cannot change The 'NotifyOnUpdate' option using the savconfig command locally when the Linux PC is managed (see below) from Enterprise Console.
Sophos product and version
Sophos Anti-Virus for Linux
What to do
Updates to PCs in managed installations of Sophos Anti-Virus for Linux are always logged by default. To turn off logging in the update policy settings in Enterprise Console:
- In Enterprise Console, highlight the appropriate update policy.
- Right-click and select View/Edit policy details.
- In the list of operating systems, select Linux.
- On the logging tab, deselect 'Log Sophos AutoUpdate activity'.
- Click OK.
A managed installation means that when Sophos Anti-Virus was installed on the Linux PC, a copy of Sophos Remote Management System (RMS) was also installed, allowing the PC to be managed by Enterprise Console.