I have the same problem using a standard (no-keyboard) Kindle (Autumn 2011 Kindle version) on 10.04 LTS, Lucid Lynx.
Unable to stop Kindle Internal Storage
Error detaching: helper exited with exit code 1: Detaching device /dev/sdd
USB device: /sys/devices/pci0000:00/0000:00:1d.1/usb7/7-2)
SYNCHRONIZE CACHE: OK
STOP UNIT: FAILED: No such file or directory
I have the same problem using a standard (no-keyboard) Kindle (Autumn 2011 Kindle version) on 10.04 LTS, Lucid Lynx.
Unable to stop Kindle Internal Storage pci0000: 00/0000: 00:1d.1/ usb7/7- 2)
Error detaching: helper exited with exit code 1: Detaching device /dev/sdd
USB device: /sys/devices/
SYNCHRONIZE CACHE: OK
STOP UNIT: FAILED: No such file or directory