Isso funcionou para mim:
The Unity plugin box is not checked in CCSM by default. Login and select unity 2d. Open CCSM and check the Unity plugin box. Log out and back in with Unity selected.
Estou executando o Ubuntu 11.10 x86_64, com o gráfico ATI Mobility Radeon HD3650
A UNity não inicia, mas ainda tenho a unidade 2D.
Eu tentei compiz --replace
isso me dá:
Checking if settings need to be migrated ...no
Checking if internal files need to be migrated ...no
Backend : gconf
Integration : true
Profile : default
Adding plugins
Skipping upgrade com.canonical.unity.unity.01.upgrade
Skipping upgrade com.canonical.unity.unity.02.upgrade
Initializing core options...done
...
...
Initializing fade options...done
Initializing scale options...done
Initializing session options...done
compiz (core) - Warn: no exact match for ConfigureNotify on 0x2e00092!
compiz (core) - Warn: expected the following changes:
compiz (core) - Warn: sibling: 0x43ee95
compiz (core) - Warn: instead got:
compiz (core) - Warn: x: 0
compiz (core) - Warn: y: 0
compiz (core) - Warn: width: 1440
compiz (core) - Warn: height: 900
compiz (core) - Warn: above: 0
compiz (core) - Warn: this should never happen. you should probably file a bug about this.
Setting Update "left_key"
Setting Update "right_key"
Setting Update "up_key"
Setting Update "down_key"
Obrigado pelas suas respostas.