Hi!
I want read/inform about these plugins and what are they doing.
dconf-editor path:
/com/canonical/unity/settings-daemon/plugins/
I can't find a manpage about it.
Where I can about these plugins?
Before I invest time composing a post explaining these plugins, or even finding a URL which documents them: Why are you still using Unity?? I thought it was mostly dead by now. Besides, this is a MATE forum.
Not trying to chase you off, but what kind of application requires you to tweak around with these settings? 
@ gordon,
because I found the entry above in the dconf-editor.
I do not use Unity.
Can I disable all these plugins under the entry above in my first post in dconf-editor.
I want change "/com/canonical/unity/settings-daemon/plugins/whitelisted-plugins"
whitelisted-plugins : ['all'] (Default-value)
to
whitelisted-plugins :
I would find it good if you could remove individual paths and keys by hand in the dconf-editor.
With dconf reset as far as I know you can only restore the default entries.
Too bad there is no dconf remove (path/key).
Package is installed:
unity-settings-daemon-schemas
Can I remove package unity-settings-daemon-schemas?
When I try to remove it, Synaptic wants also remove package indicator-session.
If that's the case then you should probably leave the schemas alone.
However, if you really want to get rid of them (Warning: Slight danger zone), you can create a backup copy of the file /usr/share/glib-2.0/schemas/com.canonical.unity.settings-daemon.plugins.gschema.xml.in.in and then remove the original, and run the command mate-panel --replace &. If that does not display an error message, congrats! But if it does then you need to put the file back in its former location and do another /usr/share/glib-2.0/schemas/com.canonical.unity.settings-daemon.plugins.gschema.xml.in.in.
Either way, the schema does pretty much nothing by itself, except stuff like the Indicator Applet depends on the schema most likely because the Indicator Applet uses some parameter under that schema. Again, be careful, and certainly don't delete the entire package unless you're willing to let the Indicator Applet (Session component) go.
ok, I will try it out in the next days.