/usr/share/man/man8/synce-serial-start-device.8.gz is in synce-serial 0.11-5.3.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/man/man8/synce-serial-start.8.gz
/usr/share/man/man8/synce-serial-start.8.gz