After upgrading from Ubuntu 16.04 to 17.04 then to 17.10, and after this the shortcut to lock the screen Super + L is not working any more. I have checked the keyboard shortcuts and it's configured correctly. Others shortcuts like Super + A or S or D are working fine.
I have tried to bind the lock action to another set of keys but doesn't work either.
Best Answer
I'm also having this problem though without the gsettings weirdness. There's a bug report open here https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/1715435