Public bug reported:
with the gnupg2 version 2.1.11-6ubuntu2 shipped with ubuntu 16.04 it is
impossible to send an encrypted email to people using up-to-date ECC
algorithms in their OpenPGP key. newer encryption algorithms *should* be
omitted by older gnupg2 versions in favor of supported alternatives, but
in fact they are not. this might be caused by the accompanying version
of libgcrypt20 assuming it can support the algorithm, but then the too
old gnupg2 version cannot. in the end, all you get is a very meaningless
error that "an error occurred".
to reproduce the problem, install ubuntu xenial and try to send an
encrypted message to the very author of GnuPG (OpenPGP key ID
0xF2AD85AC1E42B367). good luck with that.
please upgrade gnupg2 to a more recent version.
** Affects: gnupg2 (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1677903
Title:
unable to send encrypted message with state-of-the-art OpenPGP keys
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