/usr/share/ardour5/mcp/ is in ardour-data 1:5.12.0-3.
This file is owned by root:root, with mode 0o755.
..
/usr/share/ardour5/mcp/SSL Nucleus Ardour.profile
/usr/share/ardour5/mcp/artist_control.device
/usr/share/ardour5/mcp/artist_mix.device
/usr/share/ardour5/mcp/bcf2000.device
/usr/share/ardour5/mcp/cmc.device
/usr/share/ardour5/mcp/mc+xt+xt.device
/usr/share/ardour5/mcp/mc+xt.device
/usr/share/ardour5/mcp/mc.device
/usr/share/ardour5/mcp/mcpro.device
/usr/share/ardour5/mcp/mcproxt.device
/usr/share/ardour5/mcp/midikbd.device
/usr/share/ardour5/mcp/nucleus-platform-midi.device
/usr/share/ardour5/mcp/nucleus.device
/usr/share/ardour5/mcp/qcon.device
/usr/share/ardour5/mcp/user.profile
/usr/share/ardour5/mcp/x-touch-compact.device
/usr/share/ardour5/mcp/x-touch-mini.device
/usr/share/ardour5/mcp/x-touch.device
/usr/share/ardour5/mcp/xt+mc+xt.device
/usr/share/ardour5/mcp/xt+mc.device
/usr/share/ardour5/mcp/xt+xt+mc.device