Ju Ping, I see the problem in your bug description:

compiz (core) - Error: Couldn't load plugin '/usr/lib/compiz/libunityshell.so' 
: /usr/lib/compiz/libunityshell.so: undefined symbol: 
_ZNK5unity4dash10Controller6windowEv
compiz (core) - Error: Couldn't load plugin 'unityshell'

It looks like maybe one of your unity packages has not been upgraded.

Please run this command in a terminal and attach the output to this bug:
dpkg -l | grep unity

** This bug is no longer a duplicate of bug 982485
   [regression] Nvidia 295.40: Unity 3D does not work at all with the new 
nvidia driver

** Summary changed:

- Unity 5.12 Not Loading after Upgrade
+ Unity 5.12 not loading after upgrade (compiz/libunityshell.so: undefined 
symbol: _ZNK5unity4dash10Controller6windowEv)

** Changed in: unity
       Status: New => Incomplete

** Also affects: unity (Ubuntu)
   Importance: Undecided
       Status: New

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

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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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