Ошибка перезагрузки диспетчера пакетов Synaptic

Я получаю эту ошибку при попытке перезагрузить Synaptic, я установил приложения в терминал через ppa, который я нашел на launchpad.net, и удалил файлы с других сайтов разработчиков...

Could not download all repository indexes

The repository may no longer be available or could not be contacted because of network problems. If available an older version of the failed index will be used. Otherwise the repository will be ignored. Check your network connection and ensure the repository address in the preferences is correct.

Failed to fetch dl.google.com/linux/deb/dists/stable/Release  Unable to find expected entry 'non-free/binary-amd64/Packages' in Release file (Wrong sources.list entry or malformed file)
Failed to fetch ppa.launchpad.net/apt-fast/stable/ubuntu/dists/trusty/main/source/Sources  404  Not Found
Failed to fetch ppa.launchpad.net/apt-fast/stable/ubuntu/dists/trusty/main/binary-amd64/Packages  404  Not Found
Failed to fetch ppa.launchpad.net/apt-fast/stable/ubuntu/dists/trusty/main/binary-i386/Packages  404  Not Found
Failed to fetch ppa.launchpad.net/nanny/ppa/ubuntu/dists/trusty/main/source/Sources  404  Not Found
Failed to fetch ppa.launchpad.net/nanny/ppa/ubuntu/dists/trusty/main/binary-amd64/Packages  404  Not Found
Failed to fetch ppa.launchpad.net/nanny/ppa/ubuntu/dists/trusty/main/binary-i386/Packages  404  Not Found
Failed to fetch ppa.launchpad.net/stebbins/handbrake-releases/ubuntu/dists/trusty/main/source/Sources  404  Not Found
Failed to fetch ppa.launchpad.net/stebbins/handbrake-releases/ubuntu/dists/trusty/main/binary-amd64/Packages  404  Not Found
Failed to fetch ppa.launchpad.net/stebbins/handbrake-releases/ubuntu/dists/trusty/main/binary-i386/Packages  404  Not Found
Some index files failed to download. They have been ignored, or old ones used instead.

Кто-то предложил мне редактировать /etc/apt/sources.listКогда я открываю его, все, что я вижу, - это обычный ubuntu ppa's