Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: gnome-screensaver (Ubuntu)
Status: New => Confirmed
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This still happens in 17.10, and it is probably because a DBUS call
Totem does, as deleting
/usr/share/dbus-1/services/org.gnome.ScreenSaver.service solves the
problem.
Btw, gnome-screensaver-command -l doesn't even notify you when it didn't
do anything. At least cinnamon-screensaver-command -l
