ports.ubuntu.com is for other architectures like armhf or powerpc, not i386. Your /etc/apt/sources.list file is misconfigured somehow and you'll need to manually resolve the issue for the upgrade to complete.
** Changed in: ubuntu-release-upgrader (Ubuntu) Status: New => Invalid -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1431710 Title: Impossible de télécharger http://ports.ubuntu.com/ubuntu- ports/dists/precise/main/binary-i386/Packages 404 Not Found Impossible de télécharger http://ports.ubuntu.com/ubuntu- ports/dists/precise/multiverse/binary-i386/Packages 404 Not Found Impossible de télécharger http://ports.ubuntu.com/ubuntu-ports/dists /precise-updates/main/binary-i386/Packages 404 Not Found Impossible de télécharger http://ports.ubuntu.com/ubuntu-ports/dists/precise- updates/multiverse/binary-i386/Packages 404 Not Found To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1431710/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs