The problem is : now that I forced the update of ubuntu-minimal from 1.18 version to 1.19 (which provoked the installation of upstart packages), each time I try to automatically update my packages, ubuntu- minimal and upstart packages are selected for uninstall, and sysvinit for install.
-- Sysvinit "wants" to install and replace upstart https://launchpad.net/bugs/59039 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs