For some reason my lock screen changed a while ago from the new one introduced in 14.04 to the one used in older versions. I'm not sure what I may have done to have caused this.
How can I get the new one back?
For some reason my lock screen changed a while ago from the new one introduced in 14.04 to the one used in older versions. I'm not sure what I may have done to have caused this.
How can I get the new one back?
Please press < Alt + F2 > and type/run
and see if that gets you what you want. What I suspect is that you may have installed some software at some point that changes which command Unity uses for it's screen locking mechanism. If the command I provided does what you want, then I have two different things you can try.
Reinstall gnome-screensaver
If the original command worked as you had hoped but the issue persists after trying solution #1, then open the system settings menu, select the keyboard section, and create a custom keyboard shortcut with that command in it and map it to whatever combination you would like to use to lock your screen.