[Bug 1667605] [NEW] Installer fail to load kernel modules when using kickstart

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## Ubuntu version ##
ubuntu-16.10-server-amd64

## Environment ##
VirtualBox 5.1.6

## Problem description ##
Ubuntu server installer fail to load kernel modules when a kickstart file is used as boot parameter. The installer is then unable to detect network interfaces (because module e1000 is not loaded) and fail
https://ibin.co/3DTY1ZsdqEud.jpg
https://ibin.co/3DTYIkXmSwmt.jpg

## How to reproduce ##
The bug happens with VirtualBox but also with all physical machines I tested the kickstart installation on.
To reproduce this bug you just have to start a new VirtualBox Linux VM and start a new ubuntu server installation with boot option "ks=http://foo.bar/ks.cfg"
https://ibin.co/3DTkQZRuGLZN.jpg

Here is the command line used to boot (more information available within the attached syslog file): 
Kernel command line: file=/cdrom/preseed/ubuntu-server.seed vga=788 initrd=/install/initrd.gz DEBCONF_DEBUG=5 ks=http://foo.bar/ks.cfg ---  keyboard-configuration/layoutcode=fr keyboard-

** Affects: debian-installer (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: bot-comment http installer kickstart
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Installer fail to load kernel modules when using kickstart
https://bugs.launchpad.net/bugs/1667605
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