This file is indexed.

/lib/modprobe.d/aliases.conf is in kmod 22-1ubuntu5.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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# These are the standard aliases and dependencies.
# This file does not need to be modified.

# prevent unusual drivers from appearing as the first sound device ###########
options snd-pcsp index=-2
options snd-usb-audio index=-2
options cx88_alsa index=-2
options snd-atiixp-modem index=-2
options snd-intel8x0m index=-2
options snd-via82xx-modem index=-2

# work around other kernel issues ############################################
# The EHCI driver should be loaded before the ones for low speed controllers
# or some devices may be confused when they are disconnected and reconnected.
softdep uhci-hcd pre: ehci-hcd
softdep ohci-hcd pre: ehci-hcd