This question already has an answer here:
My laptop is connected to two external monitors. When I switch workspaces, only the main monitor will switch, and the second monitor will stay fixed.
Since I want to switch between several task, each requiring the use of two monitors, this is really annoying.
I found another similar question here for Ubuntu 11.10. The answer provided was to execute the command:
gconftool-2 --set /desktop/gnome/shell/windows/workspaces_only_on_primary false --type bool
I managed to execute the command (no errors), but the problem continued even after a re-login.
Is this solvable on Ubuntu 14.04?