[ubuntu] unable to enumerate USB device

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http://ubuntuforums.org – Hello, I'm having troubles connecting my external usb harddrive. After disconnecting and connecting it sometimes works but most of the time I see this message in the log: [ 393.364074] usb 1-1: new high speed USB device using ehci_hcd and address 17 [ 393.516104] hub 1-0:1.0: unable to enumerate USB device on port 1 Anybody any idea on how to solve this? Thanks. (Hardware)