"apt install foo/bar" will try to satisfy dependencies of foo from release bar if the current candidates do not satisfy the requirements. That is more a feature for going to a PPA (or backports) than leaving it and has some issues, but it exists (e.g. your downgrade has probably all dependencies satisfied by the already installed [newer] versions from the PPA).
Note that downgrades are still unsupported and can break your system, so that is really not a painless action. Nobody said activating PPAs left and right is something you can or should do – or that it is easy to change your might. You probably want something like "pick all packages from PPA foo and install from bar". I think you can express something like that with the newish patterns, but note that apt doesn't really know if a package was installed from PPA foo. It guesses that if the current version is the same as the version in the PPA it was installed from there, but that isn't the same thing… -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1857018 Title: apt-get: Can not downgrade dependencies or anything with -t To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/apt/+bug/1857018/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
