I want to install kali linux repository in Ubuntu 18.04

apt-key adv --keyserver pgp.mit.edu --recv-keys ED444FF07D8D0BF6

This return an error as follow.

gpg: keyserver receive failed: Server indicated a failure
  • THere is a known issue with PGP Keyservers as a result of some nasty CVEs that makes the keyservers very slow to respond and reply. You may just need to try again at a later time. – Thomas Ward Dec 26 '18 at 17:34

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