It's something from avahi-daemon. apt-get purge avahi-daemon solves the issue and reinstalling it makes it appear again.
** No longer affects: sysvinit (Ubuntu) ** No longer affects: upstart (Ubuntu) ** Also affects: avahi (Ubuntu) Importance: Undecided Status: New -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1230056 Title: /etc/network/if-post-down.d/avahi-daemon is a symbolic link to `../if- up.d/avahi-daemon' To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/avahi/+bug/1230056/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs