I've seen this bug as well, though in my case exim4 was refusing to start because it was misconfigured. Since exim4 wasn't started, I couldn't install an mta that I knew how to configure until I fixed exim4's configuration. A vexing situation...
I've seen this bug as well, though in my case exim4 was refusing to start because it was misconfigured. Since exim4 wasn't started, I couldn't install an mta that I knew how to configure until I fixed exim4's configuration. A vexing situation...