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
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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'
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