MarsSeed [1] filed a deletion request for ros-noetic-trac-ik [2]: Unused, obsolete. Upstream's ROS1 support (v1.x series) is EOL since 2021. [a] The AUR package and its "trac-ik" dependency chain is unmaintained since 2020. These are also not compatible with Arch Linux anymore, only with the freshly EOL Ubuntu 20.04 LTS and Python 3.8 / 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/