Parece que se você chegou aqui instalando xorg-edgers, então (do bug):
sudo ppa-purge xorg-edgers
Você pode precisar reiniciar depois disso, mas pelo menos reiniciar o X:
sudo service lightdm restart
Após a atualização, o Unity 3D não está mais funcionando. Eu tentei várias coisas:
O que posso fazer para que a unidade funcione? Unity 2D, sessões Gnome funcionam bem.
tony@xllap ~ # /usr/lib/nux/unity_support_test -p
OpenGL vendor string: NVIDIA Corporation
OpenGL renderer string: Quadro NVS 140M/PCI/SSE2
OpenGL version string: 3.3.0 NVIDIA 285.05.09
Not software rendered: yes
Not blacklisted: yes
GLX fbconfig: yes
GLX texture from pixmap: yes
GL npot or rect textures: yes
GL vertex program: yes
GL fragment program: yes
GL vertex buffer object: yes
GL framebuffer object: yes
GL version is 1.4+: yes
Unity 3D supported: yes
tony@xllap:~$ unity --reset
WARNING: Unity currently default profile, so switching to metacity while resetting the values
unity-panel-service: Kein Prozess gefunden
Checking if settings need to be migrated ...no
Checking if internal files need to be migrated ...no
Backend : gconf
Integration : true
Profile : unity
Adding plugins
Skipping upgrade com.canonical.unity.unity.01.upgrade
Skipping upgrade com.canonical.unity.unity.02.upgrade
Initializing core options...done
Initializing bailer options...done
Initializing detection options...done
Initializing composite options...done
Initializing opengl options...done
Initializing decor options...done
Initializing mousepoll options...done
Initializing vpswitch options...done
Initializing animation options...done
Initializing snap options...done
compiz (expo) - Warn: failed to bind image to texture
Initializing expo options...done
Initializing move options...done
Initializing place options...done
Initializing grid options...done
Initializing gnomecompat options...done
Initializing wall options...done
Initializing ezoom options...done
Initializing workarounds options...done
Initializing resize options...done
Initializing fade options...done
Initializing unitymtgrabhandles options...done
Initializing scale options...done
I/O warning : failed to load external entity "/home/tony/.compiz/session/106db7534999063ba5131867168837080100000180430006"
Initializing session options...done
error in geis_init
Screen geometry changed:
1680x0x1920x1080
0x0x1680x1050
unity-panel-service: Kein Prozess gefunden
unity-panel-service: Kein Prozess gefunden
Segmentation fault