Cannot lock screen due Unknown option -lock

[Denis Gorodnichev]

ubuntu-mate-default-settings provides default configuration to lock screen at file
/usr/share/glib-2.0/schemas/ubuntu-mate.gschema.override

by default to lock screen used command "mate-screensaver-command -lock" but mate-screensaver-command accept "--lock" argument

$ grep command /usr/share/glib-2.0/schemas/ubuntu-mate.gschema.override
[org.mate.Marco.keybinding-commands]
command-1='mate-screensaver-command -lock'
command-2='mate-screenshot --area --interactive'
run-command-1='<Mod4>l'
run-command-2='<Shift>Print'
run-command-terminal='<Control><Alt>t'

~/.xsession-errors contains "** (mate-screensaver-command:23100): WARNING **: Unknown option -lock"

[Etienne Papegnies (etienne-papegnies)]

I see the same thing in the same file on my machine, but I have no issue locking the screen.
Do I need to do anything more to reproduce?

[Denis Gorodnichev (d-g)]

Try to reset /org/mate/marco/keybinding-commands/command-1 to default value

$ dconf reset /org/mate/marco/keybinding-commands/command-1

[Denis Gorodnichev (d-g)]

or switch to custom value
$ dconf write /org/mate/marco/keybinding-commands/command-1 "'mate-screensaver-command -lock'"

[Denis Gorodnichev (d-g)]

And press "Lock screen" keybinding

[Launchpad Janitor (janitor)]

This bug was fixed in the package ubuntu-mate-settings - 18.04.1

---------------
ubuntu-mate-settings (18.04.1) bionic; urgency=medium

  * Add window buttons applet to Mutiny layout.
  * Conform to glib-compile-schema naming convention for overrides. (LP: #1577715)
  * Correct Super+L keybinding to lock the screen. (LP: #1728880)
  * Drop AppMenu integration for Firefox and Thunderbird. (LP: #1719134)
  * Use defaultPref() for Firefox defaults. (LP: #1721965) However, the
    defaultPref() functionality is broken due to this upstream bug report:
    https://bugzilla.mozilla.org/show_bug.cgi?id=947838

 -- Martin Wimpress <email address hidden> Wed, 15 Nov 2017 23:05:55 +0000