It probably isn't stuck. You just need to "force" it to the other monitor. You can change a setting to make it like you expect.
Open the CompizConfig Settings Manager (or install it if you don't have it) -> go to Ubuntu Unity Plugin (again, you may need to install this if you don't have it) -> Experimental Tab. At the bottom uncheck Launcher Capture Mouse. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/993117 Title: Dual monitor setup stops mouse from switching screens in Ubuntu 12.04 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/unity/+bug/993117/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs