I have found a solution that at least worked for me.
I do not claim that this is the absolute end-solution for this problem and it 
would like Timo to have a look on it to confirm that this is the way to go.

As I mentioned above is the guest user working without any problems.
What differs between my not working user and the guest user might cause the 
problem.
So I started comparing and found that ~/.cache/compizconfig-1/core.pb is only 
82 bytes while the same file for guest contains 4237 bytes. My original core.pb 
is nearly empty.

What I did was the following:

- first make a backup of ~/.cache/compizconfig-1/core.pb You can now always 
revert the change
- su root
- copy core.pb to your own home dir to ~/.cache/compizconfig-1/core.pb
- chmod the file to your user
- reboot

All went working again. I can use the unity launcher again. Perfect!

It is clear to me that is not the entire solution. The file might have
been corrupted by an update and might be corrupted again. So the fix
needs to correct the damaging part and also load the correct config. At
least I have found a temporary solution and I'm very happy with it
because I can use my computer again. I was forced to use Windows and
that was no fun.

Cheers, Mark

-- 
You received this bug notification because you are a member of Ubuntu-X,
which is subscribed to mesa in Ubuntu.
https://bugs.launchpad.net/bugs/1735594

Title:
  [regression] compiz crashes after Mesa upgrade

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/mesa/+bug/1735594/+subscriptions

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