Workaround to keep the notification-daemon running

The real problem is described here [1], and this workaround can be
safely removed after that patch lands our notification-daemon's
debian package. It's worth to investigate whether we're going to
receive this patch as an update of our base distro, either from
Debian, Ubuntu or Mint.

[1] https://bugzilla.gnome.org/show_bug.cgi?id=728157