Thanks for your report.
The valid components for Ubuntu are 'main', 'restricted', 'universe' and
'multiverse'. There is no 'non-free' nor 'contrib' that's for debian.
Update you sources.list accordingly and try performing the upgrade again.
I'm closing this report because that's not a bug with Ubuntu.
Don't hesitate to submit any new bug.
** Changed in: update-manager (Ubuntu)
Status: New => Invalid
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karmic --> lucid dist upgrade fails; unable to download something
https://bugs.launchpad.net/bugs/573234
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