please upgrade to the latest duply version (1.10.1)
as of 1.9.2, an important change allows to extract the secret key file again. Before 1.9.2, new duply installs are more or less broken with GnuPG 2.1.x
Created attachment 161522 [details]
diff for 1.10.1
A commit references this bug:
Date: Wed Oct 14 11:32:22 UTC 2015
New revision: 399251
Update to 1.10.1.
Don't install the license file twice.
Submitted by: Philip Jocks
Sponsored by: Absolight