[Mailman-Users] Error updating mailman Ubuntu 14.04.3

[billy noah]

Tried running an update today and received this message:

Setting up mailman (1:2.1.16-2ubuntu0.1) ...
Looking for enabled languages (this may take some time) ... done.
Removing unmodified files from /etc/mailman/eu  done.
Directory /etc/mailman/eu not empty, not removed.
*... {repeat above message for each language} ...*
Removing unmodified files from /etc/mailman/sv  done.
Directory /etc/mailman/sv not empty, not removed.
Removing unmodified files from /etc/mailman/ast  done.
Directory /etc/mailman/ast not empty, not removed.
Installing site language en ............................................
done.
Downgrade detected, from version 0x20112f1 to version 0x20110f0
This is probably not safe.
Exiting.
dpkg: error processing package mailman (--configure):
 subprocess installed post-installation script returned error exit status 1
Errors were encountered while processing:
 mailman
E: Sub-process /usr/bin/dpkg returned an error code (1)

Any ideas what I can do to remedy this?