Richard Kirk wrote: > I am sure the real clue lies in the fact I can run it under 'su root' but not > under > 'su'. I shall work on that. I have tried all the different 'sudo' options to > try and > get the environments and shells to match. Another possible angle is to get a usbmon trace at the time of the failure, and compare that to the 'su root' case and see if that shows anything interesting. Graeme Gill.