I have find the solution for the failed update:
Here is the solution.
For those who are new to Ubuntu OS. Please follow this step.
(1) Use Administration under system
(2) click Synaptic package manager as Superuser.
(3) under search or/quick filter--- type "amavisd-new, unmarked both 
amavisd-new and amavisd-new mailfilter for complete uninstalled. 
(4) When it finished uninstalled restart your system and you are done.

(5) Use your ubuntu updater again as superuser, to check any new update if 
there is any. The updater will install for you. When finished restart your 
system and you are done.
Bravo.

I guess update fail because there is duplicate file system preventing the new 
update to be installed.
Good luck.
VKMORE

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https://bugs.launchpad.net/bugs/1637140

Title:
  package amavisd-new (not installed) failed to install/upgrade:
  subprocess installed post-installation script returned error exit
  status 1

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