unable to unmount encfs encryped folder in cryptkeeper

My educated guess is that encfs is mounted as a FUSE module. For that Nautilus is a bit confused as on how to unmount it.

Try using fusermount on the commandline:

fusermount -u /path/to/mountpoint

Where /path/to/mountpoint should be /home/xxxxx/Encrypted in your case.

Make sure you've closed all applications (including Nautilus) using that volume before attempting to unmount it.

Do not use your file manager (nautilus in your case) to unmount the encrypted folder.

Simply untick the relevant encrypted folder in the tray applet. It should dismount without any problem. To remount, you simply tick the encrypted folder again in the tray applet.

Try typing this in to a terminal:

sudo umount /home/xxxxx/Encrypted.