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In case you're wondering, I've already been through a few questions on the same topic here, and a bunch of threads on forums here and there. No solution seems to apply to my case. I have 11.10 currently installed on my machine. Some time ago I received regularly notifications of upgrade to 12.04. The release upgrade button showed up regularly in the Update Manager. But so far I have ignored all of this because I wanted to get back home before updating the system (just in case I needed a second machine to repair an unsuccessful upgrade). So every time the notification window showed up I've clicked on "Ask me Later". Now that I want to upgrade: 1. The button is no longer in the Update Manager 2. sudo do-release-upgrade -d returns "No new release found" 3. sudo update-manager --dist-upgrade returns "Your system is up-to-date"

Apparently I can install normal updates, so I'd rule connectivity issues out.

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Put here the ouptutof: more /etc/lsb-release – LnxSlck Aug 6 '12 at 14:31
DISTRIB_ID=Ubuntu DISTRIB_RELEASE=11.10 DISTRIB_CODENAME=oneiric DISTRIB_DESCRIPTION="Ubuntu 11.10" – Phoenix87 Aug 6 '12 at 18:20

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