Config files from a Dell Precision M3800 with Ubuntu 14.04 preinstalled: /boot/grub/grub.cfg, /etc/apt/sources.list, /etc/apt/sources.list.d/trusty-dell.list, /etc/apt/sources.list.d/trusty-oem.list

grub.cfg

#
# DO NOT EDIT THIS FILE
#
# It is automatically generated by grub-mkconfig using templates
# from /etc/grub.d and settings from /etc/default/grub
#

### BEGIN /etc/grub.d/00_header ###
if [ -s $prefix/grubenv ]; then
  set have_grubenv=true
  load_env
fi
if [ "${next_entry}" ] ; then
   set default="${next_entry}"
   set next_entry=
   save_env next_entry
   set boot_once=true
else
   set default="0"
fi

if [ x"${feature_menuentry_id}" = xy ]; then
  menuentry_id_option="--id"
else
  menuentry_id_option=""
fi

export menuentry_id_option

if [ "${prev_saved_entry}" ]; then
  set saved_entry="${prev_saved_entry}"
  save_env saved_entry
  set prev_saved_entry=
  save_env prev_saved_entry
  set boot_once=true
fi

function savedefault {
  if [ -z "${boot_once}" ]; then
    saved_entry="${chosen}"
    save_env saved_entry
  fi
}
function recordfail {
  set recordfail=1
  if [ -n "${have_grubenv}" ]; then if [ -z "${boot_once}" ]; then save_env recordfail; fi; fi
}
function load_video {
  if [ x$feature_all_video_module = xy ]; then
    insmod all_video
  else
    insmod efi_gop
    insmod efi_uga
    insmod ieee1275_fb
    insmod vbe
    insmod vga
    insmod video_bochs
    insmod video_cirrus
  fi
}

if [ x$feature_default_font_path = xy ] ; then
   font=unicode
else
insmod part_gpt
insmod ext2
set root='hd0,gpt4'
if [ x$feature_platform_search_hint = xy ]; then
  search --no-floppy --fs-uuid --set=root --hint-bios=hd0,gpt4 --hint-efi=hd0,gpt4 --hint-baremetal=ahci0,gpt4  663421f4-e03e-4722-a8d1-126ab7b8c033
else
  search --no-floppy --fs-uuid --set=root 663421f4-e03e-4722-a8d1-126ab7b8c033
fi
    font="/usr/share/grub/unicode.pf2"
fi

if loadfont $font ; then
  set gfxmode=auto
  load_video
  insmod gfxterm
  set locale_dir=$prefix/locale
  set lang=en_US
  insmod gettext
fi
terminal_output gfxterm
if [ "${recordfail}" = 1 ] ; then
  set timeout=-1
else
  if [ x$feature_timeout_style = xy ] ; then
    set timeout_style=hidden
    set timeout=0
  # Fallback hidden-timeout code in case the timeout_style feature is
  # unavailable.
  elif sleep --interruptible 0 ; then
    set timeout=0
  fi
fi
### END /etc/grub.d/00_header ###

### BEGIN /etc/grub.d/05_debian_theme ###
set menu_color_normal=white/black
set menu_color_highlight=black/light-gray
if background_color 44,0,30,0; then
  clear
fi
### END /etc/grub.d/05_debian_theme ###

### BEGIN /etc/grub.d/10_linux ###
function gfxmode {
	set gfxpayload="${1}"
	if [ "${1}" = "keep" ]; then
		set vt_handoff=vt.handoff=7
	else
		set vt_handoff=
	fi
}
if [ "${recordfail}" != 1 ]; then
  if [ -e ${prefix}/gfxblacklist.txt ]; then
    if hwmatch ${prefix}/gfxblacklist.txt 3; then
      if [ ${match} = 0 ]; then
        set linux_gfx_mode=keep
      else
        set linux_gfx_mode=text
      fi
    else
      set linux_gfx_mode=text
    fi
  else
    set linux_gfx_mode=keep
  fi
else
  set linux_gfx_mode=text
fi
export linux_gfx_mode
menuentry 'Ubuntu' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-simple-663421f4-e03e-4722-a8d1-126ab7b8c033' {
	recordfail
	load_video
	gfxmode $linux_gfx_mode
	insmod gzio
	insmod part_gpt
	insmod ext2
	set root='hd0,gpt4'
	if [ x$feature_platform_search_hint = xy ]; then
	  search --no-floppy --fs-uuid --set=root --hint-bios=hd0,gpt4 --hint-efi=hd0,gpt4 --hint-baremetal=ahci0,gpt4  663421f4-e03e-4722-a8d1-126ab7b8c033
	else
	  search --no-floppy --fs-uuid --set=root 663421f4-e03e-4722-a8d1-126ab7b8c033
	fi
	linux	/boot/vmlinuz-3.13.0-46-generic root=UUID=663421f4-e03e-4722-a8d1-126ab7b8c033 ro  quiet splash pcie_aspm=force radeon.modeset=0 nouveau.modeset=0 $vt_handoff
	initrd	/boot/initrd.img-3.13.0-46-generic
}
submenu 'Advanced options for Ubuntu' $menuentry_id_option 'gnulinux-advanced-663421f4-e03e-4722-a8d1-126ab7b8c033' {
	menuentry 'Ubuntu, with Linux 3.13.0-46-generic' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-3.13.0-46-generic-advanced-663421f4-e03e-4722-a8d1-126ab7b8c033' {
		recordfail
		load_video
		gfxmode $linux_gfx_mode
		insmod gzio
		insmod part_gpt
		insmod ext2
		set root='hd0,gpt4'
		if [ x$feature_platform_search_hint = xy ]; then
		  search --no-floppy --fs-uuid --set=root --hint-bios=hd0,gpt4 --hint-efi=hd0,gpt4 --hint-baremetal=ahci0,gpt4  663421f4-e03e-4722-a8d1-126ab7b8c033
		else
		  search --no-floppy --fs-uuid --set=root 663421f4-e03e-4722-a8d1-126ab7b8c033
		fi
		echo	'Loading Linux 3.13.0-46-generic ...'
		linux	/boot/vmlinuz-3.13.0-46-generic root=UUID=663421f4-e03e-4722-a8d1-126ab7b8c033 ro  quiet splash pcie_aspm=force radeon.modeset=0 nouveau.modeset=0 $vt_handoff
		echo	'Loading initial ramdisk ...'
		initrd	/boot/initrd.img-3.13.0-46-generic
	}
	menuentry 'Ubuntu, with Linux 3.13.0-46-generic (safe mode)' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-3.13.0-46-generic-recovery-663421f4-e03e-4722-a8d1-126ab7b8c033' {
		recordfail
		load_video
		insmod gzio
		insmod part_gpt
		insmod ext2
		set root='hd0,gpt4'
		if [ x$feature_platform_search_hint = xy ]; then
		  search --no-floppy --fs-uuid --set=root --hint-bios=hd0,gpt4 --hint-efi=hd0,gpt4 --hint-baremetal=ahci0,gpt4  663421f4-e03e-4722-a8d1-126ab7b8c033
		else
		  search --no-floppy --fs-uuid --set=root 663421f4-e03e-4722-a8d1-126ab7b8c033
		fi
		echo	'Loading Linux 3.13.0-46-generic ...'
		linux	/boot/vmlinuz-3.13.0-46-generic root=UUID=663421f4-e03e-4722-a8d1-126ab7b8c033 ro recovery nomodeset 
		echo	'Loading initial ramdisk ...'
		initrd	/boot/initrd.img-3.13.0-46-generic
	}
	menuentry 'Ubuntu, with Linux 3.13.0-38-generic' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-3.13.0-38-generic-advanced-663421f4-e03e-4722-a8d1-126ab7b8c033' {
		recordfail
		load_video
		gfxmode $linux_gfx_mode
		insmod gzio
		insmod part_gpt
		insmod ext2
		set root='hd0,gpt4'
		if [ x$feature_platform_search_hint = xy ]; then
		  search --no-floppy --fs-uuid --set=root --hint-bios=hd0,gpt4 --hint-efi=hd0,gpt4 --hint-baremetal=ahci0,gpt4  663421f4-e03e-4722-a8d1-126ab7b8c033
		else
		  search --no-floppy --fs-uuid --set=root 663421f4-e03e-4722-a8d1-126ab7b8c033
		fi
		echo	'Loading Linux 3.13.0-38-generic ...'
		linux	/boot/vmlinuz-3.13.0-38-generic.efi.signed root=UUID=663421f4-e03e-4722-a8d1-126ab7b8c033 ro  quiet splash pcie_aspm=force radeon.modeset=0 nouveau.modeset=0 $vt_handoff
		echo	'Loading initial ramdisk ...'
		initrd	/boot/initrd.img-3.13.0-38-generic
	}
	menuentry 'Ubuntu, with Linux 3.13.0-38-generic (safe mode)' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-3.13.0-38-generic-recovery-663421f4-e03e-4722-a8d1-126ab7b8c033' {
		recordfail
		load_video
		insmod gzio
		insmod part_gpt
		insmod ext2
		set root='hd0,gpt4'
		if [ x$feature_platform_search_hint = xy ]; then
		  search --no-floppy --fs-uuid --set=root --hint-bios=hd0,gpt4 --hint-efi=hd0,gpt4 --hint-baremetal=ahci0,gpt4  663421f4-e03e-4722-a8d1-126ab7b8c033
		else
		  search --no-floppy --fs-uuid --set=root 663421f4-e03e-4722-a8d1-126ab7b8c033
		fi
		echo	'Loading Linux 3.13.0-38-generic ...'
		linux	/boot/vmlinuz-3.13.0-38-generic.efi.signed root=UUID=663421f4-e03e-4722-a8d1-126ab7b8c033 ro recovery nomodeset 
		echo	'Loading initial ramdisk ...'
		initrd	/boot/initrd.img-3.13.0-38-generic
	}
}

### END /etc/grub.d/10_linux ###

### BEGIN /etc/grub.d/20_linux_xen ###

### END /etc/grub.d/20_linux_xen ###

### BEGIN /etc/grub.d/20_memtest86+ ###
### END /etc/grub.d/20_memtest86+ ###

### BEGIN /etc/grub.d/30_os-prober ###
### END /etc/grub.d/30_os-prober ###

### BEGIN /etc/grub.d/30_uefi-firmware ###
menuentry 'System setup' $menuentry_id_option 'uefi-firmware' {
	fwsetup
}
### END /etc/grub.d/30_uefi-firmware ###

### BEGIN /etc/grub.d/40_custom ###
# This file provides an easy way to add custom menu entries.  Simply type the
# menu entries you want to add after this comment.  Be careful not to change
# the 'exec tail' line above.
### END /etc/grub.d/40_custom ###

### BEGIN /etc/grub.d/41_custom ###
if [ -f  ${config_directory}/custom.cfg ]; then
  source ${config_directory}/custom.cfg
elif [ -z "${config_directory}" -a -f  $prefix/custom.cfg ]; then
  source $prefix/custom.cfg;
fi
### END /etc/grub.d/41_custom ###

### BEGIN /etc/grub.d/99_dell_recovery ###
menuentry "Restore Ubuntu 14.04 to factory state" {
        search --no-floppy --hint '(hd0,msdos3)' --set --fs-uuid E4E1-728A
        set uuid_options="uuid=E4E1-728A"
        if [ -s /factory/common.cfg ]; then
            source /factory/common.cfg
        else
            set options="boot=casper automatic-ubiquity noprompt quiet splash"
        fi
        #Support starting from a loopback mount (Only support ubuntu.iso for filename)
        if [ -f /ubuntu.iso ]; then
            loopback loop /ubuntu.iso
            set root=(loop)
            set options="$options iso-scan/filename=/ubuntu.iso"
        fi
        if [ -n "${lang}" ]; then
            set options="$options locale=$lang"
        fi

        linux   /casper/vmlinuz.efi dell-recovery/recovery_type=hdd $uuid_options $options 
	initrd	/casper/initrd.lz
}
### END /etc/grub.d/99_dell_recovery ###

sources.list

# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
# newer versions of the distribution.
deb http://archive.ubuntu.com/ubuntu/ trusty main restricted
deb-src http://archive.ubuntu.com/ubuntu/ trusty main restricted

## Major bug fix updates produced after the final release of the
## distribution.
deb http://archive.ubuntu.com/ubuntu/ trusty-updates main restricted
deb-src http://archive.ubuntu.com/ubuntu/ trusty-updates main restricted

## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
## team. Also, please note that software in universe WILL NOT receive any
## review or updates from the Ubuntu security team.
deb http://archive.ubuntu.com/ubuntu/ trusty universe
deb-src http://archive.ubuntu.com/ubuntu/ trusty universe
deb http://archive.ubuntu.com/ubuntu/ trusty-updates universe
deb-src http://archive.ubuntu.com/ubuntu/ trusty-updates universe

## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
## team, and may not be under a free licence. Please satisfy yourself as to
## your rights to use the software. Also, please note that software in
## multiverse WILL NOT receive any review or updates from the Ubuntu
## security team.
deb http://archive.ubuntu.com/ubuntu/ trusty multiverse
deb-src http://archive.ubuntu.com/ubuntu/ trusty multiverse
deb http://archive.ubuntu.com/ubuntu/ trusty-updates multiverse
deb-src http://archive.ubuntu.com/ubuntu/ trusty-updates multiverse

## N.B. software from this repository may not have been tested as
## extensively as that contained in the main release, although it includes
## newer versions of some applications which may provide useful features.
## Also, please note that software in backports WILL NOT receive any review
## or updates from the Ubuntu security team.
deb http://archive.ubuntu.com/ubuntu/ trusty-backports main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu/ trusty-backports main restricted universe multiverse

deb http://security.ubuntu.com/ubuntu trusty-security main restricted
deb-src http://security.ubuntu.com/ubuntu trusty-security main restricted
deb http://security.ubuntu.com/ubuntu trusty-security universe
deb-src http://security.ubuntu.com/ubuntu trusty-security universe
deb http://security.ubuntu.com/ubuntu trusty-security multiverse
deb-src http://security.ubuntu.com/ubuntu trusty-security multiverse

## This software is not part of Ubuntu, but is offered by Canonical and the
## respective vendors as a service to Ubuntu users.
deb http://archive.canonical.com/ubuntu trusty partner
deb-src http://archive.canonical.com/ubuntu trusty partner

## Uncomment the following two lines to add software from Ubuntu's
## 'extras' repository.
## This software is not part of Ubuntu, but is offered by third-party
## developers who want to ship their latest software.
# deb http://extras.ubuntu.com/ubuntu trusty main
# deb-src http://extras.ubuntu.com/ubuntu trusty main

trusty-dell.list

deb http://dell.archive.canonical.com/updates/ trusty-dell public
deb-src http://dell.archive.canonical.com/updates/ trusty-dell public

trusty-oem.list

deb http://oem.archive.canonical.com/updates/ trusty-oem public
deb-src http://oem.archive.canonical.com/updates/ trusty-oem public

Thanks! How is your xorg.conf when running with the nvidia card? I have terrible performance with it, trying to install on a laptop shipped with windows.