MarsSeed [1] filed a deletion request for ros-indigo-stage [2]:
Defunct package from the 2014 release ('Indigo') of the
ROS: 'Robot Operating System'
Package last updated in 2017. It is now defunct because
most ROS Indigo packages depend on broken or missing
Python 2 modules.
This one depends on gtk2, but ROS has much newer releases
which use gtk3 and Python 3.
Therefore I suggest to delete it.
[1] https://aur.archlinux.org/account/MarsSeed/
[2] https://aur.archlinux.org/pkgbase/ros-indigo-stage/