/usr/share/bash-completion/completions/dconf is in dconf-cli 0.26.0-2+b1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 | # Check for bash
[ -z "$BASH_VERSION" ] && return
####################################################################################################
__dconf() {
  local choices
  case "${COMP_CWORD}" in
    1)
      choices=$'help \nread \nlist \nwrite \nreset\n update \nlock \nunlock \nwatch \ndump \nload '
      ;;
    2)
      case "${COMP_WORDS[1]}" in
        help)
          choices=$'help \nread \nlist \nwrite \nreset\n update \nlock \nunlock \nwatch \ndump \nload '
          ;;
        list|dump|load)
          choices="$(dconf _complete / "${COMP_WORDS[2]}")"
          ;;
        read|list|write|lock|unlock|watch|reset)
          choices="$(dconf _complete '' "${COMP_WORDS[2]}")"
          ;;
      esac
      ;;
    3)
      case "${COMP_WORDS[1]} ${COMP_WORDS[2]}" in
	reset\ -f)
          choices="$(dconf _complete '' "${COMP_WORDS[3]}")"
          ;;
      esac
      ;;
  esac
  local IFS=$'\n'
  COMPREPLY=($(compgen -W "${choices}" "${COMP_WORDS[$COMP_CWORD]}"))
}
####################################################################################################
complete -o nospace -F __dconf dconf
 |