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Possible Duplicate:
How to install software or upgrade from old unsupported release?

I am using Ubuntu 11.04. Update Manager does not finish update since 'Applying Changes' does not finish and says:

Failed to download package files. Check your Internet connection.

How do I resolve this?

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marked as duplicate by Andrea Corbellini, gertvdijk, hhlp, bodhi.zazen, Chris Wilson Feb 4 '13 at 21:56

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.

Change your download server from "Software Sources" app.Does it work? – Hckr Nov 12 '12 at 14:59
In addition, could you share the error in details when it failed? – Hckr Nov 12 '12 at 15:07
Does it fail from command line too? Try this in a terminal: sudo apt-get update. If it shows errors, could you post them here? – sierrasdetandil Nov 12 '12 at 15:48

Ubuntu 11.04 is Natty Narwhal is no longer supported in any way. The repositories are not there any more.

The repositories still exist but have been moved and are no longer being updated.

If you want to continue using an outdated release then edit /etc/apt/sources.list and change to

I would not recommend this as there will be no more bug fixes, security patches etc

I strongly suggest you upgrade to 12.04 LTS. This will be easiest as a clean install. The alternative is to upgrade to 11.10 and then upgrade again.

I suggest you try a live CD/DVD of both Xubuntu and Ubuntu without installing as the desktop has changed significantly: Xubuntu is more like Ubuntu was in 10.04 and Ubuntu now uses Unity and this may be too slow on older hardware. Once you have decided which you prefer install it.

Downloads are here: Ubuntu --

Xubuntu --

You can of course go with 12.10 but not being an LTS release you will need to upgrade sooner.

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