I enabled workspaces from Appearance in Ubuntu 14.04 LTS, tried to do the Ctrl Alt Left/Right to switch workplaces but it doesn't seem to work. I tried restarting my computer which didn't work. Checked the shortcut settings in the keyboard to make sure everything was right that Ctrl+Alt+Left/Right is still the shortcut and it is. Even right clicking a window, it doesn't say "move this to left/right workplace".
This started after I reinstalled Ubuntu. I recently reinstalled Ubuntu after trying to dual-boot Windows alongside it, and now this doesn't work. I have disabled Unity, I'm using Gnome. It worked before when I disabled Unity for Gnome as well.
Tried to be as detailed as possible, let me know if you need more thanks in advance.
Switched from GNOME (Compiz) to GNOME (Metacity) and it worked. You do that from the login screen.