Comment 4 for bug 1108342

Sorry folks, but as part of the bug clean up ahead of 16.04 I'm marking this as invalid because it affects an Ubuntu release which is now unsupported. If you can still recreate this bug in a supported release please do open a new bug and we can triage it for consideration in the 16.04 development cycle.

Additional: This seems to be related to some hardware limitations on keyboards not handling ctrl+alt+up+left at the same time, where as the other combinations work.