I am currently running Ubuntu 12.04 LTS and I want to upgrade it to 15.04. However, the update manager shows only 12.10. I tried changing its settings -> all new versions and disabling third party softwares, but it only shows 12.10. I have no pending updates on my system. How do i rectify this problem, without doing a fresh install?
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If you want to skip versions then, only Ubuntu lts versions can be upgraded from one lts to another, i.e.,
Ubuntu 12.04 lts -> Ubuntu 14.04 lts
But if you want to upgrade to any other non-lts versions, then you have to upgrade it one version at a time, i.e.,
Ubuntu 12.04 lts -> Ubuntu 12.10 -> Ubuntu 13.04 -> Ubuntu 13.10 ...
What you can do at the best here (in your case) is that, upgrade to Ubuntu 14.04 lts and then to 15.10, i.e.,
Ubuntu 12.04 lts -> Ubuntu 14.04 lts -> Ubuntu 15.04 -> Ubuntu 15.10
Raphael
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It's showing it now. Although, I still don't have an exact clue how. I tried miscellaneous methods, like changing my server to main server. Then i incorrectly modified my sources.list file. I rectified it using Arronical's method in Failed to fetch message while upgrading . Then i ran sudo update-manager -p and it showed that option.
user221478
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