I have the same problem, I also get the error "This is an encrypted
OpenPGP message. In order to decrypt this mail, you need to install an
OpenPGP add-on." But Enigmail is installed. A reboot did not help.
As a work-arround I've downloaded Enigmail from Debian 9, and installed
it using "dpkg -i".
I can encrypt messages without a problem now, but when I decrypt a
message I get this alert:
GnuPG reported an error in the communication with gpg-agent (a component
This is a system setup or configuration error that prevents Enigmail
from working properly and cannot be fixed automatically.
We strongly recommend that you consult our support web site at
After clicking OK, I see the message decrypted.
I have installed the package gnupg-agent, but I don't see pgp-agent in
the output of "ps aux".
Paul van der Vlis
Paul van der Vlis Linux systeembeheer Groningen
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