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[Ryan Harper <1372051@xxxxxxxxxxxxxxxxxx>]

I booted a precise server image:

ubuntu@ubuntu:~$ cat /etc/issue
Ubuntu 12.04.5 LTS \n \l

ubuntu@ubuntu:~$ uname -a
Linux ubuntu 3.2.0-88-virtual #126-Ubuntu SMP Mon Jul 6 21:50:59 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux

Installed ntp:

% sudo apt-get install ntp
...
http://archive.ubuntu.com/ubuntu/ precise-updates/main ntp amd64 1:4.2.6.p3+dfsg-1ubuntu3.4

ubuntu@ubuntu:~$ grep ntp /etc/group
ntp:x:112:

Then do-release-upgrade to move to 14.04 with no issues.

Examining the postinst scripts in current precise ( ), and various
trusty versions of the ntp package, the script is always idempotent
w.r.t adding the ntp group.  It's not clear to me which version of the
ntp package had a post-inst script that wasn't idempotent.  Getting a
copy of the ntp.postinst script that is failing would be most useful.

One workaround to the dist-upgrade issue is to apt-get remove --purge
ntp (which will run the postrm hook to remove the ntp group) prior to
upgrading.

** Changed in: ntp (Ubuntu)
       Status: New => Incomplete

** Changed in: ntp (Ubuntu)
     Assignee: Ryan Harper (raharper) => (unassigned)

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Touch seeded packages, which is subscribed to ntp in Ubuntu.
https://bugs.launchpad.net/bugs/1372051

Title:
  ntp postinst user/group add commands are not idempotent

Status in ntp package in Ubuntu:
  Incomplete

Bug description:
  At do release upgrade from 12.04.05 to 14.04.01, the ntp package failed:
  Errors were encountered while processing:
   ntp
  Error in function: 

  
  A fatal error occurred 

  Please report this as a bug and include the files 
  /var/log/dist-upgrade/main.log and /var/log/dist-upgrade/apt.log in 
  your report. The upgrade has aborted. 
  Your original sources.list was saved in 
  /etc/apt/sources.list.distUpgrade. 

  SystemError: E:Sub-process /usr/bin/dpkg returned an error code (1)


  Could not install the upgrades

  The upgrade has aborted. Your system could be in an unusable state. A 
  recovery will run now (dpkg --configure -a). 

  Please report this bug in a browser at 
  http://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+filebug 
  and attach the files in /var/log/dist-upgrade/ to the bug report. 
  installArchives() failed 

  Setting up ntp (1:4.2.6.p5+dfsg-3ubuntu2) ...
  dpkg: error processing package ntp (--configure):
   subprocess installed post-installation script returned error exit status 1
  Errors were encountered while processing:
   ntp

  Upgrade complete

  The upgrade has completed but there were errors during the upgrade 
  process. 


  In /var/lib/dpkg/info/ntp.postinst the add group / adduser commands fail due to already existing group / user.
  Appended “ || /bin/true” to those lines, and “dpkg —configure ntp” succeeded.

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