how to upgrade ubuntu 12.04 to 13.04. What is the difference of these versions. after ending the support of 13.04 what we have to do?
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You need to first upgrade 12.04 to 12.10. Then you can upgrade it using sudo do-release-upgrade -d or you can try this https://help.ubuntu.com/community/RaringUpgrades. This might also help you can-i-skip-over-releases-when-upgrading.