FileVault and TimeMachine restoration - Unable to turn on FileVault again I have restored a MBP timemachine backup to a new MBP. On my older machine I have enabled FileVault. 

The restoration was long. It took about almost 12 hours to transfer 500Gb of data.

In the new unit I have experienced a few problem (e.g. unable to install VirtualBox )

When I checked FileValut setting in 'Security &amp; Privacy', I can see it is turned off. 



When I tried to turn it on, I got this dialog box



and then this dialog box appears:



A 'Meraki Management' profile is installed on this MBP.
After some investigation, the problem has something to do with nix, which I have installed on my old MBP. 

To make FileVault work again, I have to remove all the nix users and nix user group.