Comment 2 for bug 1652695

It appears that this is not a high priority issue, since the default NTP configuration will automatically exclude the leap-smearing source, given sufficient other good sources:

http://pastebin.ubuntu.com/23720277/

However, we may want to consider changing the default ntp configuration to use 'server' rather than 'pool' for ntp.ubuntu.com, to ensure that it is included in the configuration at least once.