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I have an Ubuntu 9.04 PC behind a corporate firewall and proxy server. This requires that in order to get update-manager to fetch and apply updates, I must set the proxy and authentication settings in the Synaptic network configuration. Once done, I can check for updates and things work smoothly (except I don't get popup notifications of new updates, must manually check periodically).

However, distribution updates just don't show up in update-manager, such as the newly released 9.10 Karmic Koala. I had the same issue in upgrading 8.10 to 9.04 and solved it by downloading and upgrading from the 9.04 ISO.

What do I need to do to upgrade to 9.10 using the standard update-manager UI?

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marked as duplicate by harrymc, Kevin Panko, Breakthrough, Moses, Mokubai Jun 17 '14 at 20:29

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.

I would advise against upgrading any OS. With Karmic it's not as bad as it used to be, but there are still plenty of people with problems. IMO: keep your home on a separate partition and clean-install the OS partition every time. – bobince Oct 30 '09 at 11:44
I see the merit in avoiding updates. It's certainly the case with Windows. However, I had the impression package-based installs were clean enough to do whole release upgrades like this. My home PC started with 7.04 and has been upgraded to each release without issues. Reinstalling sounds too intrusive. – spoulson Oct 30 '09 at 17:00
I don't think it's Windows-specific; any case where you have the remnants of old software and settings living with new runs the risk of incompatibilities. I've seen a couple of Ubuntus and SuSEs and many Debians fall victim to bad upgrades in addition to the known Windows problems. What's worse, if you find yourself with an odd problem later on, you'll never know if it's a simple distro bug or whether the upgrade had anything to do with it. – bobince Oct 31 '09 at 17:30
having the same problem going form 9.10 to 10.4 – cmcginty Apr 30 '10 at 1:27
Does do-release-upgrade work? – ephemient Mar 25 '12 at 5:44

Try to choose a new server. This helped me to get the distribution update.

Under Paketmanager choose Software Sources

Software Sources

Then choose "Download from:" -> "more"

Choose Download Server

In this dialog, execute "Select best server". Ubuntu will try to detect the fastest connection to a bunch of mirrors.

Source: Accelerate the upgrade and installation of packages in Ubuntu

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Perhaps your update manager isn't set to display distribution updates? Open the Update Manager and find the "Settings" button on the lower left. Flip to the "Updates" tab and check the setting labeled "Release upgrade". It should be set to "Normal releases".

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Check. This is set properly. – spoulson Oct 30 '09 at 11:40
It is all set like you suggest, but still I cannot update from 12.04 to 14.04 – rubo77 Apr 19 '14 at 9:02

You may want to use update-manager -d to display development release upgrades.

However, you may have problems upgrading from behind a proxy, as there seems to be a bug in update-manager which causes it to ignore proxy settings for distribution upgrades.

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