Make a backup of old sources
cd /etc/apt/ cp sources.list sources.list.OLD
and add only this line to the sources.list
deb http://deb.debian.org/debian/ jessie contrib main non-free
If you get an error like this when trying to update
/etc/apt# apt-get update Ign http://deb.debian.org jessie InRelease Hit http://deb.debian.org jessie Release.gpg Hit http://deb.debian.org jessie Release Hit http://ppa.launchpad.net trusty InRelease Get:1 http://deb.debian.org jessie/contrib amd64 Packages [49.8 kB] Hit http://ppa.launchpad.net trusty/main amd64 Packages Get:2 http://deb.debian.org jessie/main amd64 Packages [6818 kB] E: The method driver /usr/lib/apt/methods/https could not be found. N: Is the package apt-transport-https installed?
and you can't install the apt-transport-https, make a symlink in /usr/lib/apt/methods to force the apt to use http:
cd /usr/lib/apt/methods ln -s http https
apt update and installation should work now.