Today is the release of Ubuntu 21.04 (Hirsute Hippo). And I can't update to this version.
And also I selected ‘Notify me of a new Ubuntu version’ and changed it to ‘For any new version' on the Updates tab on Software & Update, but it's still not working. In addition, in the terminal, I've written:
sudo do-release-upgrade -c
And output was:
Checking for a new Ubuntu release No new release found.
What should I do?