Removing dead sources in Debian properly

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As I tried to install Java on a Server running under Debian Linux, I broke my source list and got http://ppa.launchpad.net/webupd8team/java/ubuntu/dists/jessie/main/binary-amd64/Packages 404 Not Found by attempts to run sudo apt-get update

Deleting the line http://ppa.launchpad.net/webupd8team/java/ubuntu/dists/jessie/main/binary-amd64/ from /etc/apt/sources.list (which is a file) did not help.

Additional necessary steps are as follows:
1. change to /etc/apt/sources.list.d (which is a directory) and remove the shit their (in my case
sudo rm webupd8team-java-jessie.list.save and
sudo rm webupd8team-java-jessie.list)
2. It also will not hurt to run
sudo rm /var/lib/apt/lists/* -rvf

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And then fix the problem like this

# grep -ri stable /etc
/etc/apt.conf.d/99myDefaultRelease:APT::Default-Release “stable”;

So changing that file to “jessie” would fix it in my case (as I’m on jessie.)

(in my case the filename in /etc/apt.conf.d/ was 00local)

https://superuser.com/questions/575753/how-can-i-fix-the-error-the-value-stable-is-invalid-for-aptdefault-release/575754

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