Ubuntu 20 is un-supported since last month, unless you have a special contract.
Ubuntu long-term support releases (LTS) are released every 2 years by Canonical. Canonical provides patching and maintenance for Ubuntu LTS releases for 5 years for all packages in the main repository. For Ubuntu 20.04 LTS, this support will last until 31 May 2025.
I recommend to upgrade to a newer version to get security and bug fixes.