Well that is a new one 
You are breaking experimental ground here I think.
What does Edit -> Preferences -> Folders -> Plug-ins tell you about locations for plug-ins.
Is it home/zero01/.config/GIMP/2.10/plug-ins ? Does running Gimp 2.10 first time make that folder?
Can you add a (single plugin) in ..../usr/lib/gimp/2.0/plug-ins/ the Gimp system folder? All the plugins are now in their own folders but do not need to be.
If you did a sudo apt-get install gimp-gmic that is where that will be.
You are breaking experimental ground here I think.What does Edit -> Preferences -> Folders -> Plug-ins tell you about locations for plug-ins.
Is it home/zero01/.config/GIMP/2.10/plug-ins ? Does running Gimp 2.10 first time make that folder?
Can you add a (single plugin) in ..../usr/lib/gimp/2.0/plug-ins/ the Gimp system folder? All the plugins are now in their own folders but do not need to be.
If you did a sudo apt-get install gimp-gmic that is where that will be.