How can I upgrade from 11.04 to 12.04? [duplicate]

So I have Ubuntu installed on my pc, and I want to upgrade to the new Ubuntu which was just released. When I check for any new updates it doesn't show any upgrades to the new release. How can I fix this? Thanks!

If you're not getting an option to upgrade then your local mirror might be out of date, you can either wait a bit for that to resolve itself, or manually switch to another mirror. You should also make sure your software properties settings are correct.

• How can I get apt to use a mirror close to me, or choose a faster mirror?

After that follow the upgrade instructions:

• How do I upgrade to a newer version of Ubuntu?

do-release-upgrade in terminal should work

Press Alt + F2 and paste: gksu software-properties-gtk.

Then go to tab "Updates" and at "Notify me about new Ubuntu version" choose "For any version".

(Or if you are at 10.04, go to tab "Updates" and at "Release upgrade" choose "Normal Releases")

Finally open Update Manager and check it again.

Reference: How do I upgrade to a newer version of Ubuntu?

In the Update Manager settings, make sure "Notify me of a new Ubuntu version" is not set to "Never."