Because of no new security fix, I had to downgrade a package (libimlib2) to reproduce the bug.
** Attachment added: "Update-manager log" http://librarian.launchpad.net/5024082/u-m.log -- Update-manager does NOT download nor install softwares https://launchpad.net/bugs/70033 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
