Ubuntu do-release-upgrade failed due to not supported version

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If below error happened while execute do-release-upgrade.

do-release-upgrade
Checking for a new Ubuntu release
Your Ubuntu release is not supported anymore.

Follow below step to fix.

Run below command

sudo apt upgrade

And then

sudo apt dist-upgrade

Then try again do-release-upgrade.

Refer – https://askubuntu.com/questions/1390585/my-ubuntu-says-i-should-upgrade-but-then-doesnt-let-me