The script only works flashing first time. Now you tried, could be that this “first time” is over.
Follow this steps:
So its easier to follow at which point it doesnt work. And the bug-report you mention, describes a problem with a driver. I think, in the past there have been problems while flashing with Linux because of problems with the usb-cable/port or with some bad magic because of the used version of “android-tools(-fastboot)”.