MarsSeed [1] filed a deletion request for ros-noetic-trac-ik-python [2]: Unused, obsolete. Unmaintained on AUR since 2020. Upstream's ROS1 (Noetic) support (trac-ik v1.x series) is EOL since 2021. [a] Many Noetic packages are not compatible with Arch Linux, as they were meant only for the freshly EOL Ubuntu 20.04 LTS and Python 3.9. [a]: https://bitbucket.org/traclabs/trac_ik/downloads/?tab=tags [1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/ros-noetic-trac-ik-python/