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When i click reload after few minutes I get this error :

W: Failed to fetch       
Hash Sum mismatch, E:Some index files failed to download. 
They have been ignored, or old ones used instead.

How do I fix this?

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Possibly you have a slow or a mirror that is not fully up-to-date.

Suggest use Software Sources and change your mirror - i.e. Choose Other from Download from and change to another mirror source.

Finally re-run update-manager and check for new updates.

enter image description here

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