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This question already has an answer here:

Software Updater on Ubuntu 16.04 doesn't show Ubuntu 18.04 update. I have checked and all settings are good.

What do I need to do?

marked as duplicate by pomsky, Zanna, wjandrea, Fabby, karel Apr 27 '18 at 21:52

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  • This appears to be a general problem. Although the 18.04 iso is available it is still not possible to upgrade using 'sudo apt dist-upgrade' and "sudo do-release-upgrade' results in the message "No new release found." Perhaps 18.04 will be available for upgrade soon. – John Wayland Bales Apr 27 '18 at 18:22
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From this Ubuntu Wiki we have the notice:

Upgrading from Ubuntu 16.04 LTS or 17.10

Upgrades from 17.10 will not be enabled until a few days after 18.04's release. Upgrades from 16.04 LTS will not be enabled until a few days after the 18.04.1 release expected in late July.

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