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Yesterday I upgraded to 11.04 and I found out the new Linux kernel 2.6.38 did not work. The maverick kernel however did. Searching at askubuntu I found some tips which suggested to disable quiet splash in the grub config (/etc/default/grub).

I supposed it had something to do with the video driver, so I disabled the nvidia proprietary driver and rebooted. This didn't really work and eventually I ended up with a the non-graphical tty1.

With startx I tried to start the graphical environment again, but this resulted in an error like:

Failed to load module "nvidia" (module does not exist, 0)

After that I booted in recovery mode and reinstalled the nvidia driver again, after the classic gnome worked again, but Unity doesn't work yet. Also in classic all (compiz) effects are disabled.

I guess I have to get that working again and Unity will work after that too, question is: how?

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I also tried compiz --replace (and unity --replace) which had this output: It looks like opengl is failing. – arian May 1 '11 at 19:33
It seems I'm using nouveau now, which doesn't really work with compiz yet... I didn't mange to switch to nvidia properly though. – arian May 1 '11 at 20:46
I tried these steps: but I cannot find the linux-headers-2.6.35 in the repository anymore. I'm using that kernel because the 2.6.38 didn't boot at all. – arian May 1 '11 at 20:48
Why 2.6.38 didn't boot? What are messages in console and logs? – Extender May 3 '11 at 5:18

I struggled for a while in a similar spot. Ulimately my problem was that I hadn't installed the latest Nvidia drivers like I thought I had. Execute the following:

$ cat /proc/driver/nvidia/version

NVRM version: NVIDIA UNIX x86 Kernel Module 270.41.06 Mon Apr 18 14:54:25 PDT 2011 GCC version: gcc version 4.5.2 (Ubuntu/Linaro 4.5.2-8ubuntu4)

If you are seeing 173 or 185 in the output, you have an older version of the Nvidia driver installed. Older versions don't work that well - I found that out the hard way.

If this is your problem, launch "Additional Drivers" via the Gnome/System->Administration menu. It should allow you to choose to install the "current version". Choose to do that.

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I think it will not work with 2.6.35 kernel – Extender May 3 '11 at 5:17

I'm thinking compizconfig-settings-manager is the package you're looking for...

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I already have ccsm installed, and the Unity and other plugins are all enabled, so I don't think that's it. – arian May 1 '11 at 19:03

I had a similar problem where Unity wouldn't work but Gnome would. I resolved this by logging in under Ubuntu (unity) and then pulled up ccsm. In ccsm disabling Gnome Compatibility and enabling Unity worked for me. Hope this helps.

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