On Mon, 7 May 2018 18:44:51 -0400
Bob Goodwin wrote:
I copy the data to the device in a terminal, it takes perhaps 30
seconds, when finished I close that to make the flash drive free and
then go to the desktop, click on the unmount and this last time waited
~125 seconds for it to unmount before disconnecting the usb flash drive.
Perhaps that is clearer
You could try doing a sudo umount manually and see if it takes
just as long. If it is quick, then something stoopid is going on in
all the gui layers.