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You need to set up both your Raspberry Pi and Ubuntu (running in VMWare) to use a time synchronisation service.
Ubuntu should be set up automatically, I think, but here is the documentation so you can check.
For the Raspberry Pi, it depends on which OS you have installed. Are you using Raspbian? Chrony is often mentioned as being both easy to set up and reliable on wifi connections (the original Turtlebot instructions explicitly discuss it).