Note:- This is clearly an OS issue. With 18.04 there is no problem. Please let 
me know where is the culprit... 
Type of installation - UEFI with secure boot disabled

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https://bugs.launchpad.net/bugs/1818816

Title:
  Ubuntu 16.04 LTS + "lspci: Cannot open /sys/bus No such file" on Dell
  5820 Tower

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  Hello Team,

  I'm experiencing similiar issue on Ubuntu 16.04 on Dell 5820 Tower
  over UEFI installation. I'm using Display port monitor, inorder to get
  proper display I need to download nvidia driver from ppa:graphics-
  drivers/ppa

  After install nvidia-384 and did a reboot, still no display, but can
  able to see the PCI modules conflicted

  #lspci -v 
  lspci: Cannot open /sys/bus/pci/devices/0000:00:03.0/resource: No such file 
or directory

  There is no issue with Ubuntu 18.04 , which is works perfectly on the
  same machine. Ubuntu 16.04 having issue. Please let me know id there
  is some issue with the running kernel or any package?

  
  Below is the environment details. 
  =================================

  Ubuntu 16.04.4 LTS Xenial
  Kernel - 4.15.0-46-generic

  NVIDIA Quadro P4000

  $lshw -C Display
  WARNING: you should run this program as super-user.
    *-display               
         description: VGA compatible controller
         product: NVIDIA Corporation
         vendor: NVIDIA Corporation
         physical id: 0
         bus info: pci@0000:65:00.0
         version: a1
         width: 64 bits
         clock: 33MHz
         capabilities: vga_controller bus_master cap_list rom
         configuration: driver=nvidia latency=0
         resources: irq:29 memory:d7000000-d7ffffff memory:c0000000-cfffffff 
memory:d0000000-d1ffffff ioport:b000(size=128) memory:d8000000-d807ffff

  #dpkg -l  | grep  xserver-xorg-core-hwe-16.04
  ii  xserver-xorg-core-hwe-16.04                 2:1.19.5-0ubuntu2~16.04.1     


  $dpkg -l | grep nvid
  ii  nvidia-384                                  384.130-0ubuntu0.16.04.1      
                amd64        NVIDIA binary driver - version 384.130
  ii  nvidia-opencl-icd-384                       384.130-0ubuntu0.16.04.1      
                amd64        NVIDIA OpenCL ICD
  ii  nvidia-prime                                0.8.2                         
                amd64        Tools to enable NVIDIA's Prime
  ii  nvidia-settings                             415.27-0ubuntu0~gpu16.04.1    
                amd64        Tool for configuring the NVIDIA graphics driver

  #startx 
  xauth:  file /root/.Xauthority does not exist

  
  X.Org X Server 1.19.5
  Release Date: 2017-10-12
  X Protocol Version 11, Revision 0
  Build Operating System: Linux 4.4.0-101-generic x86_64 Ubuntu
  Current Operating System: Linux ADUAEIT10755WKLX 4.15.0-46-generic 
#49~16.04.1-Ubuntu SMP Tue Feb 12 17:45:24 UTC 2019 x86_64
  Kernel command line: BOOT_IMAGE=/boot/vmlinuz-4.15.0-46-generic 
root=UUID=87e6e4eb-2008-48bb-8848-3d0184ae89c1 ro quiet splash vt.handoff=7
  Build Date: 24 November 2017  09:44:25AM
  xorg-server 2:1.19.5-0ubuntu2~16.04.1 (For technical support please see 
http://www.ubuntu.com/support) 
  Current version of pixman: 0.33.6
        Before reporting problems, check http://wiki.x.org
        to make sure that you have the latest version.
  Markers: (--) probed, (**) from config file, (==) default setting,
        (++) from command line, (!!) notice, (II) informational,
        (WW) warning, (EE) error, (NI) not implemented, (??) unknown.
  (==) Log file: "/var/log/Xorg.0.log", Time: Wed Mar  6 15:14:19 2019
  (==) Using system config directory "/usr/share/X11/xorg.conf.d"
  (EE) 
  (EE) Backtrace:
  (EE) 0: /usr/lib/xorg/Xorg (xorg_backtrace+0x4e) [0x55a968970e1e]
  (EE) 1: /usr/lib/xorg/Xorg (0x55a9687bf000+0x1b5b89) [0x55a968974b89]
  (EE) 2: /lib/x86_64-linux-gnu/libpthread.so.0 (0x7fe81648b000+0x11390) 
[0x7fe81649c390]
  (EE) 3: /usr/lib/x86_64-linux-gnu/libpciaccess.so.0 (pci_device_next+0x118) 
[0x7fe817ae4a38]
  (EE) 4: /usr/lib/x86_64-linux-gnu/libpciaccess.so.0 
(pci_device_find_by_slot+0x3b) [0x7fe817ae4abb]
  (EE) 5: /usr/lib/x86_64-linux-gnu/libpciaccess.so.0 
(pci_device_vgaarb_init+0xaf) [0x7fe817ae67af]
  (EE) 6: /usr/lib/xorg/Xorg (0x55a9687bf000+0xb17a9) [0x55a9688707a9]
  (EE) 7: /usr/lib/xorg/Xorg (xf86BusConfig+0x62) [0x55a968849e62]
  (EE) 8: /usr/lib/xorg/Xorg (InitOutput+0xa13) [0x55a968857f83]
  (EE) 9: /usr/lib/xorg/Xorg (0x55a9687bf000+0x581a6) [0x55a9688171a6]
  (EE) 10: /lib/x86_64-linux-gnu/libc.so.6 (__libc_start_main+0xf0) 
[0x7fe8160e1830]
  (EE) 11: /usr/lib/xorg/Xorg (_start+0x29) [0x55a968801329]
  (EE) 
  (EE) Segmentation fault at address 0x0
  (EE) 
  Fatal server error:
  (EE) Caught signal 11 (Segmentation fault). Server aborting
  (EE) 
  (EE) 
  Please consult the The X.Org Foundation support 
         at http://wiki.x.org
   for help. 
  (EE) Please also check the log file at "/var/log/Xorg.0.log" for additional 
information.
  (EE) 
  (EE) Server terminated with error (1). Closing log file.

  Thanks

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