[ubuntu] Ubuntu can not find Ubuntu ? Upgrade 12.04 to 12.10

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http://ubuntuforums.org – sudo apt-get install update-manager-core /etc/update-manager/release-upgrades Prompt=normal; sudo apt-get update && sudo apt-get upgrade sudo do-release-upgrade -d Follow me so far? Hope so.... Updating repository information WARNING: Failed to read mirror file Third party sources disabled Some third party entries in your sources.list were disabled. You can re-enable them after the upgrade with the 'software-properties' tool or your package manager. To continue please press [ENTER] ^ OK. Simple enough. ENTER :) Checking package manager Reading package lists (Hardware)