/usr/share/qemu/vgabios-qxl.bin is in qemu-common 1.0+noroms-0ubuntu13.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/qemu/../vgabios/vgabios.qxl.bin
/usr/share/qemu/../vgabios/vgabios.qxl.bin