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System: Ubunut 22.04 LTS, distribution Ros2 Galactic

As you can see in REP-2000: ROS 2 Releases and Target Platforms, specifically the Galactic Geochelone (May 2021 - November 2022) section, Ubuntu 22.04 is not listed as a supported version of Ubuntu for ROS 2 Galactic.

The only Ubuntu distribution which gets binary packages created for it is Ubuntu Focal (20.04):

image description

apt is completely correct when it tells you it cannot find ros-galactic-desktop.

System: Ubunut 22.04 LTS, distribution Ros2 Galactic

As you can see in REP-2000: ROS 2 Releases and Target Platforms, specifically the Galactic Geochelone (May 2021 - November 2022) section, Ubuntu 22.04 is not listed as a supported version of Ubuntu for ROS 2 Galactic.

The only Ubuntu distribution which gets binary packages created for it is Ubuntu Focal (20.04):

image description

It's also clearly stated on the installation page you link:

image description

apt is completely correct when it tells you it cannot find ros-galactic-desktop.