I'm using Ubuntu 18.04. I can find the option to change the keyboard shortcuts to move to workspace 1, 2, etc. but there doesn't seem to be an option to go to the 'next workspace', cycle through existing workspaces, as I would do with alt+tab to switch across windows.
Clicking the '+' button in the 'keyboard shortcuts' window to create a custom shortcut would probably do the trick. But I do not know what would be the command I would have to use.
