Comment 5 for bug 712905

I do not speak French. Je ne parle pas français.

This can be a duplicate of one of these: bug 663158, bug 658458 and bug 658581 (and a dozen more)

If the package xserver-xorg-video-nouveau is installed, in several cases the 10.04 to 10.10 upgrade fails with the error message

"Could not determine the upgrade
An unresolvable problem occurred while calculating the upgrade:
E:Error, pkgProblemResolver::Resolve generated breaks, this may be caused by held packages.
This can be caused by:
* Upgrading to a pre-release version of Ubuntu
* Running the current pre-release version of Ubuntu
* Unofficial software packages not provided by Ubuntu"

Several persons have reported that after removal of that package the upgrade was successful.

Try this workaround: Open a terminal and enter the command:
Essayez cette solution de contournement: Ouvrez un terminal et entrez la commande:

sudo apt-get remove xserver-xorg-video-nouveau

and try the upgrade again.
et essayez à nouveau la mise à niveau.