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/usr/share/man/man1/aarch64-linux-gnu-gnatkr.1.gz is in gnat-8-aarch64-linux-gnu 8-20180414-1ubuntu2cross1.

This file is owned by root:root, with mode 0o777.

It is a symlink to /usr/share/man/man1/aarch64-linux-gnu-gnat-8.1.gz