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There is a bit of misunderstanding
here. Lines in /etc/apt/sources.list (as well as in
sources.list.d) are just a description of used repositories. By
itself they couldn't change anything in the OS. When you 'apt-get
update' it downloads package lists. This is fine, as no damage was
done yet. But when you use apt-get upgrade, or apt-get install
(something), then those new package lists may mess up system. The
reason is that some packages may have other packages as
dependencies, and those dependencies from the newer debian version
may conflict with existing ones, or cause some packages removal
(f.e. some package may say that it 'replaces' some other package).
Rolling back this testing/stable mix is a huge pain. If you done some minor installation of something without dependencies, than you may just revert it back to older version. It there was a major update, then... Well, upgrade to testing and live with it. Or reinstall OS. If you want to understand the state of your system, look here: /var/log/apt/history.log - log of installations/upgrades /var/log/apt/term.log - output of installation process You can see currently installed packages: dpkg -l For each package you can see 'policy' by using apt-cache policy command. It shows which version of a given package is coming from which release. F.e.: apt-cache policy xpad The main pain point here is dependencies of dependencies... I was able few times roll back back upgrade, but it took me few hours of heavy work, and I couldn't recommend doing this to anyone. TL;DR; 1. If you just added those lines in sources.list - just remove them 2. If you added them and used apt-get update - remove them and call apt-get update again 3. If you installed or upgraded your system after that - you have a problem On 12/06/18 22:15, murtaugh@stat.orst.edu wrote:
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