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You need to identify the name of the serial port the U-Blox is connected to and make sure the node is connecting to it. I suspect it is a parameter in the launch file but could be listed somewhere else. Of course this assumes it's plugged in an turned on : )

There are many ways to get a list of serial ports on your machine. Google ubuntu list serial ports

They won't all be called ttyACMx, could be called ttyUSBx or ttySx.