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Ubuntu 20.10 release will reach end of life next month on July 22nd, 2021. Ubuntu 20.10 (Groovy Gorilla) was released almost 9 months ago, on October 22, 2020. Canonical says that Ubuntu Security Notices will no longer include information or updated packages for Ubuntu 20.10.
You can upgrade to Ubuntu 21.04 from Ubuntu 20.10 with the following easy steps.
In Update Manager, click the Check button to check for the any new updates.
If there are any updates to install, use the Install Updates button to install them.
Now, Run update-manager -d.
Click Upgrade and follow the on-screen instructions.