Tab auto completion does not work in gsettings and dconf?

Question

Earlier, when I used to do gsettings get org.gnome. Tab , a list of different options used to get listed. But then I changed some settings and updated my computer and found out today that Tab auto completion is not working in gsettings and dconf either.

How do I set Tab auto completion again ?

Although Tab auto completion is working fine in shell when I have to auto complete the name of a utility or name of a file.

I'm using bash version 4.4.12(1)

Output of apt-cache policy bash-completion

bash-completion:
   Installed: 1:2.1-4.3
   Candidate: 1:2.1-4.3
   Version table:
  *** 1:2.1-4.3 500
        500 http://http.kali.org/kali kali-rolling/main amd64 Packages
        100 /var/lib/dpkg/status

Answer 1

Assuming bash, Since OP haven't mentioned which shell is being used!

In order to list out or auto complete the schema files from XDG_DATA_DIR your distro should have bash-completion package installed. If it's not available please do install it using apt-get install bash-completion and restarting the terminal should work!