As usual while waiting for the next release - don't forget to check the nightly builds in the forum.
E: The repository 'http://ppa.launchpad.net/codeblocks-devs/release/ubuntu focal Release' does not have a Release file.N: Updating from such a repository can't be done securely, and is therefore disabled by default.N: See apt-secure( 8 ) manpage for repository creation and user configuration details.