cat /etc/apt/apt.conf gives:
I thought doing that would disallow the command
apt-get install wajig to work, if a newer version was available anywhere but Stable.
How do I set up APT so that such a version would require me to specify the repository name in order to install it (e.g.
apt-get --target-release testing wajig)?
[update] I wasn't aware that my question wasn't so clear. I want this to be an archive-wide setting (i.e. it should apply to each package in the Stable archive), not to some specific package.