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Hi all, I have been trying to follow the guide to installing ROS Kinetic using ubuntu 16.04 as mentioned in the guide: http://wiki.ros.org/Installation/Ubuntu However, when I reach the stage to install keys I continue to have errors. I would appreciate any help. Below is instructions I have used and the problem I faced. sawyer@sawyer-HP-Compaq-8100-Elite-CMT-PC:~$ sudo sh -c 'echo "deb http://packages.ros.org/ros/ubuntu xenial main" > /etc/apt/sources.list.d/ros-latest.list' sawyer@sawyer-HP-Compaq-8100-Elite-CMT-PC:~$ sudo apt-key adv --keyserver hkp://ha.pool.sks-keyservers.net:80 --recv-key 421C365BD9FF1F717815A3895523BAEEB01FA116 Executing: /tmp/tmp.U3ESDyQRT6/gpg.1.sh --keyserver hkp://ha.pool.sks-keyservers.net:80 --recv-key 421C365BD9FF1F717815A3895523BAEEB01FA116 gpg: requesting key B01FA116 from hkp server ha.pool.sks-keyservers.net gpgkeys: HTTP fetch error 6: Could not resolve host: ha.pool.sks-keyservers.net gpg: no valid OpenPGP data found. gpg: Total number processed: 0 gpg: keyserver communications error: keyserver helper internal error gpg: keyserver communications error: general error gpg: keyserver receive failed: general error Screenshot for the error