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The Unity interface never appeared on my laptop (Natty - Intel 945GME).

Though, according to the unity_support_test script it sould work:

/usr/lib/nux/unity_support_test -p
OpenGL vendor string:   Tungsten Graphics, Inc
OpenGL renderer string: Mesa DRI Intel(R) 945GME GEM 20100330 DEVELOPMENT x86/MMX/SSE2
OpenGL version string:  1.4 Mesa 7.10.2

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 supported:          yes

It is not really a serious problem since I can use Ubuntu Classic, but I would like to know what is wrong in my system.

Now if I try unity --replace from Ubuntu Classic, a segmentation error occurs and some problems appear instead of Unity (currently open windows "lose" their title bar, bottombar tabs are still there but no longer work, etc), so that I must use something like metacity --replace to revert to a working state.

Please can someone smart explain me what is wrong, so that I can fix my system and maybe discover what Unity is...

EDIT: I also get a segmentation error with compiz --replace.

Here is the output of unity --replace:

Backend     : gconf
Integration : false
Profile     : unity
Adding plugins
Initializing core options...done
Window created on XQueryTree, map state isViewable? 0
Window created on XQueryTree, map state isViewable? 0
Window created on XQueryTree, map state isViewable? 0
Window created on XQueryTree, map state isViewable? 0
Window created on XQueryTree, map state isViewable? 0
Window created on XQueryTree, map state isViewable? 0
Window created on XQueryTree, map state isViewable? 0
Window created on XQueryTree, map state isViewable? 0
Window created on XQueryTree, map state isViewable? 0
Window created on XQueryTree, map state isViewable? 0
Window created on XQueryTree, map state isViewable? 0
Window created on XQueryTree, map state isViewable? 0
Window created on XQueryTree, map state isViewable? 1
Window created on XQueryTree, map state isViewable? 0
Window created on XQueryTree, map state isViewable? 0
Window created on XQueryTree, map state isViewable? 0
Window created on XQueryTree, map state isViewable? 0
Window created on XQueryTree, map state isViewable? 0
Window created on XQueryTree, map state isViewable? 0
Window created on XQueryTree, map state isViewable? 0
Window created on XQueryTree, map state isViewable? 0
Window created on XQueryTree, map state isViewable? 0
Window created on XQueryTree, map state isViewable? 0
Window created on XQueryTree, map state isViewable? 0
Window created on XQueryTree, map state isViewable? 0
Window created on XQueryTree, map state isViewable? 0
Window created on XQueryTree, map state isViewable? 0
Window created on XQueryTree, map state isViewable? 0
Window created on XQueryTree, map state isViewable? 0
Window created on XQueryTree, map state isViewable? 0
Window created on XQueryTree, map state isViewable? 0
Window created on XQueryTree, map state isViewable? 0
Window created on XQueryTree, map state isViewable? 1
Window created on XQueryTree, map state isViewable? 1
Window created on XQueryTree, map state isViewable? 1
Window created on XQueryTree, map state isViewable? 1
Window created on XQueryTree, map state isViewable? 0
Window created on XQueryTree, map state isViewable? 0
Window created on XQueryTree, map state isViewable? 0
Window created on XQueryTree, map state isViewable? 0
Window created on XQueryTree, map state isViewable? 0
Window created on XQueryTree, map state isViewable? 0
Window created on XQueryTree, map state isViewable? 0
Window created on XQueryTree, map state isViewable? 0
Window created on XQueryTree, map state isViewable? 0
Window created on XQueryTree, map state isViewable? 0
Window created on XQueryTree, map state isViewable? 0
Window created on XQueryTree, map state isViewable? 0
Window created on XQueryTree, map state isViewable? 0
Window created on XQueryTree, map state isViewable? 0
Window created on XQueryTree, map state isViewable? 0
Window created on XQueryTree, map state isViewable? 0
Window created on XQueryTree, map state isViewable? 0
Window created on XQueryTree, map state isViewable? 0
Window created on XQueryTree, map state isViewable? 0
Window created on XQueryTree, map state isViewable? 0
Window created on XQueryTree, map state isViewable? 0
Window created on XQueryTree, map state isViewable? 0
Window created on XQueryTree, map state isViewable? 0
Window created on XQueryTree, map state isViewable? 0
Window created on XQueryTree, map state isViewable? 1
Window created on XQueryTree, map state isViewable? 0
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
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 staticswitcher options...done
Initializing resize options...done
Initializing fade options...done
Initializing unitymtgrabhandles options...done
Initializing scale options...done
Initializing session options...done
Segmentation fault
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1 Answer

You need to ensure you have CompizConfig Settings Manager installed and the unity plugin activated as below.

enter image description here

You can find CCSM in the software centre, just search for compiz

enter image description here

share|improve this answer
    
Thank you for your answer. I already had ccsm, so I've checked if the Unity plugin was enabled and retried unity --replace but the segmentation error is still there! I've replaced the old output with the new one in my question. –  Luc125 Aug 19 '11 at 13:27
    
There is a very good description of what a segmentation fault is on Wikipedia here. I would ensure you have your system up to date and try a restart after enabling the unity plugin in compiz –  Mark Rooney Aug 19 '11 at 13:38
    
I have tried to reboot and starting a ubuntu (Unity) session, it is still perfectly unusable, there is a kind of infinite loop: shortcut icons are visible during roughly half a second, then disappear and appear again... In compiz I had enabled the Unity plugin, and disabled other stuff that was definitely not required by Unity. –  Luc125 Aug 19 '11 at 14:25
    
I also get a segmentation error with compiz --replace –  Luc125 Aug 19 '11 at 15:19
    
@Luc1245 - There is a bug report filed on Launchpad here that may be of relevance - are you running a proprietary driver? –  Mark Rooney Aug 19 '11 at 21:46
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