How to switch users without logging out

Hello,

I share a laptop and it was previously using Debian.

With Debian, I could switch users without having to log out of the current user. Multiple users could be logged in simultaneously.

Also, if a user locked their screen, but didn't log out, and then the other user hopped on the computer, they could switch to their own account. As it stands now, with Trisquel, if the last user didn't log out, but merely locked the screen, it's impossible for the other user to use the computer, until the previous user logs out.

Is there any way around this in trisquel?

Hope I was clear enough.

Thank you in advance for the help!