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Unable to set up keys while installing ROS Kinetic on Ubuntu 16.04 LTS

I follow the instructions from here: but in the "set up your keys" step

sudo apt-key adv --keyserver hkp:// --recv-key 421C365BD9FF1F717815A3895523BAEEB01FA116

i get this:

Executing: /tmp/tmp.uIulXAU9Vn/ --keyserver
gpg: requesting key B01FA116 from hkp server
?: Host not found
gpgkeys: HTTP fetch error 7: couldn't connect: Success
gpg: no valid OpenPGP data found.
gpg: Total number processed: 0
gpg: keyserver communications error: keyserver unreachable
gpg: keyserver communications error: public key not found
gpg: keyserver receive failed: public key not found

I searched and found many answers but i think none of them solve this problem.