E: Some index files failed to download. They have been ignored, or old ones used instead [closed]

Question

I'm using Ubuntu 14.04. I have tried to modify the server in software and updates and failed. So, when I try to make update with sudo apt-get update I got this error:

W: Failed to fetch http://ppa.launchpad.net/ripps818/coreavc/ubuntu/dists/trusty/main/binary-i386/Packages  404  Not Found
W: Failed to fetch http://ubuntu.mirror.tn/dists/trusty/main/binary-amd64/Packages  404  Not Found
W: Failed to fetch http://ubuntu.mirror.tn/dists/trusty/universe/binary-amd64/Packages  404  Not Found
W: Failed to fetch http://ubuntu.mirror.tn/dists/trusty/restricted/binary-amd64/Packages  404  Not Found
W: Failed to fetch http://ubuntu.mirror.tn/dists/trusty/multiverse/binary-amd64/Packages  404  Not Found
W: Failed to fetch http://ubuntu.mirror.tn/dists/trusty/main/binary-i386/Packages  404  Not Found
W: Failed to fetch http://ubuntu.mirror.tn/dists/trusty/universe/binary-i386/Packages  404  Not Found
W: Failed to fetch http://ubuntu.mirror.tn/dists/trusty/restricted/binary-i386/Packages  404  Not Found
W: Failed to fetch   http://ubuntu.mirror.tn/dists/trusty/multiverse/binary-i386/Packages  404  Not Found

E: Some index files failed to download. They have been ignored, or old ones used instead.

any help please ?

Answer 1

Try this in the following order:

sudo su 
cd /var/lib/apt/lists/
rm -fr *
cd /etc/apt/sources.list.d/
rm -fr *
cd /etc/apt
sudo cp sources.list sources.list.old
sudo cp sources.list sources.list.tmp
sed 's/ubuntuarchive.hnsdc.com/us.archive.ubuntu.com/' sources.list.tmp | sudo tee sources.list
sudo rm sources.list.tmp*
apt-get clean
apt-get update