install dconf-editor

 $ sudo apt install dconf-editor

Reading package lists... Done

Building dependency tree       

Reading state information... Done

The following NEW packages will be installed:

  dconf-editor

0 upgraded, 1 newly installed, 0 to remove and 17 not upgraded.

Need to get 314 kB of archives.

After this operation, 1.241 kB of additional disk space will be used.

Get:1 http://id.archive.ubuntu.com/ubuntu focal/universe amd64 dconf-editor amd64 3.36.0-1 [314 kB]

Fetched 314 kB in 3s (114 kB/s)        

Selecting previously unselected package dconf-editor.

(Reading database ... 314953 files and directories currently installed.)

Preparing to unpack .../dconf-editor_3.36.0-1_amd64.deb ...

Unpacking dconf-editor (3.36.0-1) ...

Setting up dconf-editor (3.36.0-1) ...

Processing triggers for desktop-file-utils (0.24-1ubuntu3) ...

Processing triggers for mime-support (3.64ubuntu1) ...

Processing triggers for hicolor-icon-theme (0.17-2) ...

Processing triggers for gnome-menus (3.36.0-1ubuntu1) ...

Processing triggers for libglib2.0-0:amd64 (2.64.6-1~ubuntu20.04.1) ...

Processing triggers for man-db (2.9.1-1) ...

Processing triggers for bamfdaemon (0.5.3+18.04.20180207.2-0ubuntu2) ...

Rebuilding /usr/share/applications/bamf-2.index...