I filled a duplicate (#88884, sorry), got the exact same error message, and i can confirm that typing
sudo mkdir /root/.gnupg
fixed the problem. i was confused because i do have ~/.gnupg for my sudoer user.
I filled a duplicate (#88884, sorry), got the exact same error message, and i can confirm that typing
sudo mkdir /root/.gnupg
fixed the problem. i was confused because i do have ~/.gnupg for my sudoer user.