I have tried to excute sudo apt-get update command but it return below error:
E: Failed to fetch http://ppa.launchpad.net/upubuntu-com/web/ubuntu/dists/xenial/main/binary-amd64/Packages 404 Not Found
E: Some index files failed to download. They have been ignored, or old ones used instead.
Please provide solution. as I am not able to install other packages due to the error.