Impossible to launch ubuntu unity after protobuf install

[Rémi Pautrat]

Hello everyone,

I have downloaded and compiled the C++ installation of protobuf yesterday on my Ubuntu 16.04 and everything seemed to be fine (make check passed everything in particular).

Now today when I restarted my computer, I wasn't able to open unity: the launcher and top pannel have disappeared and I can't open a terminal with the classical shortcut Ctrl + Alt + T for example. When I launch unity in a terminal, I get the following error:

/usr/lib/x86_64-linux-gnu/unity/compiz-config-profile-setter:
 symbol lookup error: /usr/lib/x86_64-linux-gnu/libcompizconfig.so.0:
undefined symbol: _ZNK6google8protobuf7Message9SpaceUsedEv

It seems that the protobuf installation has messed up with compiz and unity.

I have tried several things to fix unity, but nothing worked:

• Reinstall ubuntu-desktop with
  sudo apt-get install --reinstall ubuntu-desktop
  
• Reinstall libcompizconfig and also compiz entirely with apt-get.
• Reinstall unity with apt-get
  
• Uninstall protobuf with 
  sudo make uninstall
  
    
  

Do you have any idea why this happened and how to fix this? I would like to completely undo the protobuf install and have unity back as before, but obviously sudo make uninstall wasn't enough...

Thanks in advance for your help!


[Feng Xiao]

Do you happen to install protobuf into /usr instead of the default /usr/local?

ubuntu 16.04 comes with a default installation of protobuf library and it's used by unity. Your new installation likely has overridden the default libprotobuf.so and leads to compatibility issues.

Try reinstalling the protobuf package that comes along with ubuntu. Something like:

sudo apt-get install --reinstall libprotobuf8 libprotobuf-lite8

I'm not sure which version of protobuf is on your ubuntu. libprotobuf8 is the version the comes with ubuntu 14.04. On ubuntu 16.04, it's probably libprotobuf9 or similar.

 

Thanks in advance for your help!


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