/usr/share/syslinux/themes/ubuntu-xenial/isolinux-live/vesamenu.c32 is in syslinux-themes-ubuntu-xenial 12.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/syslinux/themes/ubuntu-xenial/isolinux-live/../../../../../lib/syslinux/modules/bios/vesamenu.c32