Package: apt Version: 1.4.6 I noticed that after a fresh install of debian stretch apt-key is installed but dirmngr is not, so apt-key tries to run it but fails.
$ sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 93C4A3FD7BB9C367 Executing: /tmp/apt-key-gpghome.CiuiBNcSWq/gpg.1.sh --keyserver keyserver.ubuntu.com --recv-keys 93C4A3FD7BB9C367 gpg: failed to start the dirmngr '/usr/bin/dirmngr': No such file or directory gpg: connecting dirmngr at '/tmp/apt-key-gpghome.CiuiBNcSWq/S.dirmngr' failed: No such file or directory gpg: keyserver receive failed: No dirmngr The workaroud is to install dirmngr manually.
