Public bug reported:

The default is "grab all" which is great for convenience and can be
configured to be differently by argument -I (interface) or interface
commands in the config.

Currently it is "too" open on that.
I see it trying to bing link local addresses for each of the KVM guests I spawn.
They get virtual network devices and due to that ntp sees it tries to bind and 
fails.

   Dez 13 11:35:41 seidel ntpd[35826]: bind(31) AF_INET6 
fe80::fc54:ff:fec3:3eb0%47#123 flags 0x11 failed: Cannot assign requested 
address
   Dez 13 11:35:41 seidel ntpd[35826]: unable to create socket on vnet0 (27) 
for fe80::fc54:ff:fec3:3eb0%47#123
   Dez 13 11:35:41 seidel ntpd[35826]: failed to init interface for address 
fe80::fc54:ff:fec3:3eb0%47

** Affects: ntp (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1737998

Title:
  trying to bind on all interfaces is a good default, but fails on ipv6
  link local

Status in ntp package in Ubuntu:
  New

Bug description:
  The default is "grab all" which is great for convenience and can be
  configured to be differently by argument -I (interface) or interface
  commands in the config.

  Currently it is "too" open on that.
  I see it trying to bing link local addresses for each of the KVM guests I 
spawn.
  They get virtual network devices and due to that ntp sees it tries to bind 
and fails.

     Dez 13 11:35:41 seidel ntpd[35826]: bind(31) AF_INET6 
fe80::fc54:ff:fec3:3eb0%47#123 flags 0x11 failed: Cannot assign requested 
address
     Dez 13 11:35:41 seidel ntpd[35826]: unable to create socket on vnet0 (27) 
for fe80::fc54:ff:fec3:3eb0%47#123
     Dez 13 11:35:41 seidel ntpd[35826]: failed to init interface for address 
fe80::fc54:ff:fec3:3eb0%47

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