gpg: keyserver receive failed: No route to host

Solution:

gpg-connect-agent --dirmngr 'keyserver --hosttable'

BYE

gpg --keyserver hkp://b4ckbone.de --recv-keys 409B6B1796C275462A1703113804BB82D39DC0E3 7D2BAF1CF37B13E2069D6956105BD0E739499BDB