Could not download all repository indexes 10.04

[Yurupury]

AS part of the strategy to upgrade Ubuntu in a dual boot I read upgrading could be done using Update Manager. Current version is 10.04. But I have a problem when updating repositories since I get the following error message:

"Failed to fetch http://archive.canonical.com/dists/lucid/Release
Unable to find expected entry lynx/binary-i386/Packages in Meta-index file (malformed Release file?)
Some index files failed to download, they have been ignored, or old ones used instead."

Would someone please help me to solve this issue? So I can upgrade versions progressively to the latest keeping the dual boot structure..or is there another way?

Thank You.

Gustavo

[Frogs Hair]

Hello and Welcome

Since the 10.04 desktop has reached end of life an EOL upgrade would be the next step . The link has not been updated to include 10.04 so inserting the lucid code name when adding the old repositories would be appropriate. If at all possible backup and preform a clean installation of 12.04 . Because you have 10.04 LTS a direct upgrade to 12.04 LTS is possible, but adding the old repository complicates the process. https://help.ubuntu.com/community/EOLUpgrades