Another sysadmin added the following to sources.list:
deb http://ftp.de.debian.org/debian testing main
At some point in time a apt-get upgrade was run, causing most packages to be updated a alpha or beta package. For example apt:
$ apt-cache policy apt apt: Installed: 1.8.0~alpha3 Candidate: 1.8.0~beta1 Version table: 1.8.0~beta1 500 500 http://ftp.de.debian.org/debian testing/main amd64 Packages *** 1.8.0~alpha3 100 100 /var/lib/dpkg/status 184.108.40.206.5 500 500 http://security.debian.org jessie/updates/main amd64 Packages 220.127.116.11.4 500 500 http://debian.mirrors.ovh.net/debian jessie/main amd64 Packages
I do not have a list of packages which have been upgraded, this wouldn't be really much of an issue however, if I now disable the testing source and try to install anything there's many dispensary issues from mismatching version numbers.
Is there a way to downgrade all packages to the best candidate for the jessie source? Or get a list of all packaged that are installed from the tested source?