TCB13

Probably ...
To confirm, check it by doing "grep APPARMOR /boot/config-*" .

I try it in kernel 4.4.167.
Thank you for your help.
I am very excited that it can work very well.
But I also try it in the latest kernel 4.20,but get 'don't support the operation'.
I don't know why.
But I can have a good work in the 4.4.167.
Thank you very much!!!

Most Armbian images do not have this problem as well.
 

It should be fixed, but our fix could also be broken - RK3399 has handull of small troubles which is why we actually don't provide end user support yet. When you are approaching with a problem, you always need to provide logs (armbianmonitor -u).

I didn't encounter them by myself, but I think somebody brought up troubles when copying large files via USB3 drives. Check older posts in this subforum.

Problems are outside user space levels otherwise we would notice such problems on other boards, but we don't. Kernel is the king and the troublemaker  

You are using something what was designed for developers and for testing. Neo2 does not have stable builds with mainline kernel yet.
 
This particular error shows that daily automated system is broken and it doesn't provide consistent updates. I am working on fixing it for last two days ... try once again in a week, but beware that you are using unstable kernel, which update might break your system completely. Rather don't upgrade until stable builds are out ...

You are using modern mainline development kernel and those images are experimental. AFAIK this feature is not ported / developed / forgotten to add.