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Possible Duplicate:
Installing packages to end-of-lifed Ubuntu editions?

When the update manager tries to update the computer, it gives the message :

W: Failed to fetch
  404 Not Found

Please explain how to update version 8.10 if it gives this message.

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marked as duplicate by Christopher Kyle Horton, Rinzwind, Marco Ceppi Nov 27 '12 at 21:26

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

Please backup and reinstall a newer version. It is far better, more efficient and less prone to problems than upgrading. – Rinzwind Nov 20 '12 at 7:43

Ubuntu 8.10 and even 8.04 are no longer officially supported.

"After each version of Ubuntu has reached its end-of-life time, its repositories are removed from the main Ubuntu servers and consequently the mirrors."

This might be why you are not able to update transmission. Are you able to upgrade? i.e Does your update manager show the new version available button?

If not you might want to reinstall 12.04 if you want Long term support, else just go for the latest 12.10 version

Alternatively some other methods to do the upgrade are posted at Updating Ubuntu server from 8.10 to 10.04

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