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Just upgraded from 18 to 19 and my Unity / Compiz workspaces are only 4 instead of the configured 5 horizontal by 2 vertical (10 total)
May be related: windows don't show previews when dragging on this nvidia driver
Well, restarting fixed it. I guess loging out/in after installing a nvidia driver is not enough to truly unload/reload all the components.
Required, but never shown