Same here, when I "safely remove" the external USB drive, Maxtor, 500GB.
It does unmount as it should, though.
Ubuntu 12.04.4, gnome-shell.
Error detaching: helper exited with exit code 1: Detaching device /dev/sdc
USB device: /sys/devices/pci0000:00/0000:00:1d.7/usb2/2-1/2-1.2)
SYNCHRONIZE CACHE: OK
STOP UNIT: FAILED: No such file or directory
Same here, when I "safely remove" the external USB drive, Maxtor, 500GB.
It does unmount as it should, though.
Ubuntu 12.04.4, gnome-shell.
Error detaching: helper exited with exit code 1: Detaching device /dev/sdc pci0000: 00/0000: 00:1d.7/ usb2/2- 1/2-1.2)
USB device: /sys/devices/
SYNCHRONIZE CACHE: OK
STOP UNIT: FAILED: No such file or directory