Ubuntu Security Notice 380-2 – avahi regression: USN-380-1 fixed a vulnerability in Avahi. However, if used with Network manager, that version occasionally failed to resolve .local DNS names until Avahi got restarted. This update fixes the problem.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/53044/USN-380-2.txt
Source: https://packetstormsecurity.com/files/53044/Ubuntu-Security-Notice-380-2.html