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I downloaded the Ubuntu 12.10 desktop iso using bittorrent (because it's faster) here.

This time I'm stuck because there isn't an alternate install with a cdromupgrade script and I'm not really sure how to use apt-cdrom either.

Is there any way to use this image to upgrade my current installation without re-downloading everything ?

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closed as off topic by fossfreedom Oct 19 '12 at 20:27

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The release notes clearly indicate that you should not use CDs, but instead use the online upgrade method.

$ upgrade-manager


$ do-release-upgrade

Make sure that you change sources to prefer normal (non-lts) releases, or modify this file

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The release notes tell to use the standard upgrade manager but I didn't find where it says not to use the desktop image which clearly offers the option. – Maxime R. Oct 19 '12 at 22:55

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