Hi,
Same error here.

sudo apt-get upgrade
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following packages have been kept back:
  linux-generic linux-headers-generic linux-image-generic
0 upgraded, 0 newly installed, 0 to remove and 3 not upgraded.
1 not fully installed or removed.
After this operation, 0B of additional disk space will be used.
Do you want to continue [Y/n]? Y
Setting up ntp (1:4.2.4p8+dfsg-1ubuntu2.1) ...
chown: invalid group: `ntp:ntp'
dpkg: error processing ntp (--configure):
 subprocess installed post-installation script returned error exit status 1
Errors were encountered while processing:
 ntp
E: Sub-process /usr/bin/dpkg returned an error code (1)

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You received this bug notification because you are a member of Ubuntu
Server Team, which is subscribed to ntp in Ubuntu.
https://bugs.launchpad.net/bugs/631324

Title:
  package ntp 1:4.2.4p8+dfsg-1ubuntu2 failed to install/upgrade:
  subprocess installed post-installation script returned error exit
  status 1

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