/usr/share/a11y-profile-manager/profiles/onscreen-keyboard/mate.gsettings is in mate-accessibility-profiles 0.1.11-0ubuntu4.
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 | [org.mate.accessibility-keyboard]
enable=true
stickykeys-enable=true
stickykeys-two-key-off=false
stickykeys-modifier-beep=false
[org.gnome.desktop.a11y.applications]
screen-keyboard-enabled=true
[org.mate.applications-at]
screen-keyboard-enabled=true
|