buildbot archive signing key

i have " linuxcnc-stretch-uspace-i386-r13.iso" installed on pc I am trying to update to "master 2.9" from buildbot.linuxcnc.org/.
So following instructions on page, i put "sudo apt-key adv --keyserver hkp://keys.gnupg.net --recv-key EF1B07FEE0EE663E" in terminal, but get this in reponse :

lagun@lagun:~$ sudo apt-key adv --keyserver hkp://keys.gnupg.net --recv-key EF1B07FEE0EE663E
[sudo] password for lagun:
Executing: /tmp/apt-key-gpghome.vc4wvnRRLv/gpg.1.sh --keyserver hkp://keys.gnupg.net --recv-key EF1B07FEE0EE663E
gpg: failed to start the dirmngr '/usr/bin/dirmngr': No such file or directory
gpg: connecting dirmngr at '/tmp/apt-key-gpghome.vc4wvnRRLv/S.dirmngr' failed: No such file or directory
gpg: keyserver receive failed: No dirmngr
lagun@lagun:~$
Is this normal?
were do i apply (Key fingerprint = 4FA2 D1ED 5B2F 38AB 01A4 AB7E EF1B 07FE E0EE 663E)?
and also I don't have "linuxcnc-buildbot.list" directory, do i add one ?

any help would be greatly appreciated

thank you phillc54!