ROS on Ubuntu Loki, Elementary OS. Problem installing

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The message looks like the following

W: The repository 'http://packages.ros.org/ros/ubuntu loki Release' does not have a Release file.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
E: Failed to fetch http://in.archive.ubuntu.com/ubuntu/dists/xenial-updates/universe/binary-amd64/by-hash/SHA256/db842801ebf6a595ffdef380db19d15a14119f4cf3e9fb7fa26951854def60c1  Hash Sum mismatch
E: Failed to fetch http://packages.ros.org/ros/ubuntu/dists/loki/main/binary-amd64/Packages  404  Not Found [IP: 140.211.166.134 80]
E: Some index files failed to download. They have been ignored, or old ones used instead.
supratim@Floyd:~$ sudo apt-get install ros-kinetic-desktop-full
Reading package lists... Done
Building dependency tree       
Reading state information... Done
E: Unable to locate package ros-kinetic-desktop-full