Running 14.04 in virtualbox 4.3.8

Unable to detect the guest additions.iso when i selected the guest additions.iso in the IDE Secondary Master.

No problem, so I used wget and downloaded the iso into the guest ubuntu headless.

when I attempt to load the iso from inside using these commands:

sudo mkdir /media/iso

sudo modprobe loop

sudo mount filename.iso /media/iso -t iso9660 -o loop

At the sudo modprobe loop, I got the following error:

modprobe: ERROR: ../libkmod/libkmod.c:556 kmod_search_moddep() could not open moddep file '/lib/modules/3.13.0-24-generic/modules.dep.bin'

Here are my lsb_release -a:

No LSB modules are available.

Distributor ID: Ubuntu

Description:    Ubuntu 14.04 LTS

Release:    14.04

Codename:   trusty

EDIT:

When I typed

ls /lib/modules/*/modules.dep.bin

I get back

/lib/modules/3.11.0-20-generic/modules.dep.bin  /lib/modules/3.13.0-24-generic/mo‌​dules.dep.bin /lib/modules/3.5.0-49-generic/modules.dep.bin