Unable to upgrade from Lucid to 12.04

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http://askubuntu.com – I am trying to update to the latest LTS. My upgrade history till date is, I switched from Hardy to Lucid and set my upgrade schedule to LTS Only. AFter switching to Lucid I installed ubuntustudio. despite running update-manager -d twice I am not able to see any updates. I did the following to debug the issue. I changed the upgrade schedule to normal. I installed ubuntu-desktop from synaptics The upgrade page had a link to a website recommending removal of local/obsolete packages but almost my entire installation including linux binaries show up in that list. So I am skipping it for the ti (HowTos)