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The error message I get on trying to upgrade is

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

If none of this applies, then please report this bug against the 'update-manager' package and include the files in /var/log/dist-upgrade/ in the bug report.

Following the advice in another forum posting I have already tried sudo apt-get remove xserver-xorg-video-nouveau but this has not helped. What now? Should I report a bug?

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This problem has now been solved. Uninstalled lots of software using Synaptic, purged PPAs using Ubuntu Tweak and then used the commands sudo apt-get clean, sudo apt-get update, sudo apt-get upgrade. After doing this, upgrade worked with no problems. –  babelproofreader Aug 4 '11 at 9:58
    
You should post this as an answer instead of a comment and accept it! :) –  Kit Menke Oct 15 '11 at 4:14
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up vote 2 down vote accepted

Posting answer copied from comment above:

This problem has now been solved. Uninstalled lots of software using Synaptic, purged PPAs using Ubuntu Tweak and then used the commands sudo apt-get clean, sudo apt-get update, sudo apt-get upgrade. After doing this, upgrade worked with no problems. – babelproofreader Aug 4 '11 at 9:58

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