I have the same error occurring when trying to decrypt a removable USB
drive. Though the same machine is running on a LUKS+LVM encrypted system
disk without having any issues at all.

The actual error is:
Unable to access "64 GB Encrypted"
Error unlocking /dev/sdb1: The function 'bd_crypto_luks_open_blob' called, but 
not implemented

I have also confirmed that the USB drive in question is able to be
unencrypted and read successfully on my 16.04 machine.

Current setup info:

                         ./+o+-        glyndavies@riss
                  yyyyy- -yyyyyy+      OS: Ubuntu 18.04 bionic
               ://+//////-yyyyyyo      Kernel: x86_64 Linux 4.15.0-15-generic
           .++ .:/++++++/-.+sss/`      Uptime: 12m
         .:++o:  /++++++++/:--:/-      Packages: 1941
        o:+o+:++.`..```.-/oo+++++/     Shell: bash 4.4.19
       .:+o:+o/.          `+sssoo+/    Resolution: 3840x2520
  .++/+:+oo+o:`             /sssooo.   DE: Budgie
 /+++//+:`oo+o               /::--:.   WM: BudgieWM
 \+/+o+++`o++o               ++////.   WM Theme: Adapta
  .++.o+++oo+:`             /dddhhh.   GTK Theme: Adapta [GTK2/3]
       .+.o+oo:.          `oddhhhh+    Icon Theme: Papirus-Adapta
        \+.++o+o``-````.:ohdhhhhh+     Font: Noto Sans UI 11
         `:o+++ `ohhhhhhhhyo++os:      CPU: Intel Core i7-5600U @ 4x 3.2GHz 
           .o:`.syhhhhhhh/.oo++o`      GPU: intel
               /osyyyyyyo++ooo+++/     RAM: 1978MiB / 7661MiB
                   ````` +oo+++o\:    

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  Cannot access enctypted volume

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