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I'm running Ubuntu 11.10 x86_64, with graphic ATI Mobility Radeon HD3650

UNity doesn't start, but I still have unity 2D.

I tried compiz --replace

it gives me :

Checking if settings need to be migrated

Checking if internal files need to be migrated

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"

Thanks for your answers.

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I have a ATI Radeon Mobility X1400, and basically the same issues. I don't have a solution, but I switched to Gnome Shell (sudo apt-get install gnome-shell), it works as expected and without issues. – Liedman Oct 23 '11 at 17:58
could you paste your output of /usr/lib/nux/unity_support_test -p ? – severin Jan 1 '12 at 11:19

This worked for me:

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.

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