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Hit:1 http://us.archive.ubuntu.com/ubuntu focal InRelease

you appear to be running Ubuntu Focal (ie: 20.04).

ROS 2 Dashing is not supported on Focal.

See also Installing ROS 2 Foxy Fitzroy (which is supported on Focal) and Installing ROS 2 Dashing Diademata which states the supported OS version: Ubuntu Bionic (or 18.04).

Finally: REP 2000: ROS 2 Releases and Target Platforms also lists supported OS for Dashing.

Hit:1 http://us.archive.ubuntu.com/ubuntu focal InRelease

you appear to be running Ubuntu Focal (ie: 20.04).

ROS 2 Dashing is not supported on Focal.

See also Installing ROS 2 Foxy Fitzroy (which is supported on Focal) and Installing ROS 2 Dashing Diademata which states the supported OS version: Ubuntu Bionic (or 18.04).

And the page you link (Installing ROS 2 via Debian Packages) has this right after the TOC:

Debian packages for ROS 2 Dashing Diademata are available for Ubuntu Bionic.

Finally: REP 2000: ROS 2 Releases and Target Platforms also lists supported OS for Dashing.