How do I switch between users, without logging out?

I am using Lubuntu, my desktop environment is lxQt and screensaver is xScreensaver. I'm trying to figure out a way to switch between users, (e.g. when pressing meta + L). Even though, it is possible to lock the screen with xscreensaver, I'm unable to use "new login" button and it shows this message: > could not excute "gdmflexiserver": No such file or directory **Update 1** I have come up with something I judge to be a hacky solution: creating a keyboard shortcut that triggers dm-tool switch-to-greeter. Although, as I said: it's more like a hack than a solution. It also makes me authenticate twice: once for LightDM and another for XScreenSaver, which is not very convenient.