[Bug 910962] Re: installArchives() failed: dpkg: unrecoverable fatal error, aborting: syntax error: unknown group 'postdrop' in statoverride file Error in function: SystemError: E:Sub-process /usr/bin/dpkg returned an error code (2)

[Andrew Evans]

I was bitten by this too. In my case, it's because I installed postfix
within a chroot that I was using schroot to enter, but postfix wasn't
installed in the real root. Each time I'd enter the chroot, /etc/group
would be copied from the real root into the chroot, losing the
'postdrop' group created by dpkg-reconfigure.

Solution: create the 'postdrop' group in the real root too, and ensure
it has the same GID.

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https://bugs.launchpad.net/bugs/910962

Title:
  installArchives() failed: dpkg: unrecoverable fatal error, aborting:
  syntax error: unknown group 'postdrop' in statoverride file  Error in
  function:   SystemError: E:Sub-process /usr/bin/dpkg returned an error
  code (2)

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