Ju Ping,

The problem appears to be that you have non-standard unity packages with 
version:
    5.12+bzr2352ubuntu0+700
when they should be version:
    5.12-0ubuntu1
as shown here: https://launchpad.net/ubuntu/+source/unity

To fix the problem, please run 'software-properties-gtk' and untick all
non-standard (non-Canonical or non-Ubuntu) entries in 'Other Software'.

After that, you should be able to force the correct versions to install with 
this command:
    sudo apt-get install libunity-core-5.0-5/precise unity/precise 
unity-common/precise unity-services/precise

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https://bugs.launchpad.net/bugs/996654

Title:
  Unity 5.12 not loading after upgrade (compiz/libunityshell.so:
  undefined symbol: _ZNK5unity4dash10Controller6windowEv)

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