I install nodejs using the following command on ubuntu
curl -sL https://deb.nodesource.com/setup_8.x | sudo -E bash - sudo apt-get install -y nodejs
Then it gives this message,
Reading package lists... Done
Building dependency tree
Reading state information... Done
nodejs is already the newest version.
0 upgraded, 0 newly installed, 0 to remove and 253 not upgraded.
W: Duplicate sources.list entry https://dl.bintray.com/sbt/debian/ Packages (/var/lib/apt/lists/dl.bintray.com_sbt_debian_Packages)
W: You may want to run apt-get update to correct these problems
When I do "sudo apt-get update", I get another error,
W: Failed to fetch http://ppa.launchpad.net/chris-lea/node.js/ubuntu/dists/wily/main/binary-amd64/Packages 404 Not Found
W: Failed to fetch http://ppa.launchpad.net/chris-lea/node.js/ubuntu/dists/wily/main/binary-i386/Packages 404 Not Found
W: Failed to fetch http://ppa.launchpad.net/ole.wolf/rarcrack/ubuntu/dists/wily/main/binary-amd64/Packages 404 Not Found
W: Failed to fetch http://ppa.launchpad.net/ole.wolf/rarcrack/ubuntu/dists/wily/main/binary-i386/Packages 404 Not Found
E: Some index files failed to download. They have been ignored, or old ones used instead.
Could you please let me know what how to correct that problem?