Hi Adam,
thanks for thinking through the potential regressions with me here.
I think the one you mentioned on top is not a real one.
Let me explain why:

There is:
root@artful-test:~# cat /etc/default/ntp
NTPD_OPTS='-g'

And -g is defined as:

Defined as:
-g     Normally,  ntpd  exits  with a message to the system log if the offset 
exceeds the panic 
       threshold, which is 1000 s by default.
       This option allows the time to be set to any value without restriction; 
however, this can 
       happen only once.  If  the  threshold is exceeded after that, ntpd will 
exit with a
       message to the system log.  This option can be used with the -q and -x 
options.

I checked how much that is true backward in releases, but it seems safe.
root@trusty-test:~# cat /etc/default/ntp
NTPD_OPTS='-g'


So in the default setup ntp will do the adjustment and not refuse/drift-of-doom.
If a user explicitly changed that option we actually fix another issue with the 
SRU here.
The user that dropped the -g would expect not to do the major adjustment on his 
ntp, but the stop/ntpdate/start loop would do so.

Please get in touch with me again if you do not agree.

That said - please reconsider for Trusty sponsoring and SRU acceptance

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https://bugs.launchpad.net/bugs/1593907

Title:
  ntpdate startup routine prevents ntp service from launching up on
  Ubuntu 16.04 server on system boot; manually starting ntp service
  works: [FIX in DESCRIPTION], just need to apply it and release a new
  version

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