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/usr/share/man/man1/s390x-linux-gnu-gnat.1.gz is in gnat-5-s390x-linux-gnu 5.5.0-12ubuntu1cross1.

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

It is a symlink to /usr/share/man/man1/s390x-linux-gnu-gnat-5.1.gz