Public bug reported:

Trying to get "Xorg -configure" working again to create a monolithic
configuration file for automated distribution (the "Xorg: No devices to
configure.  Configuration failed." problem with -configure mentioned in
forums), I moved away /usr/share/X11/xorg.conf.d to get rid of any
interferences from that direction. This resulted in a crash starting
Xorg on Ubuntu Xenial:

(EE) Backtrace:
(EE) 0: /usr/lib/xorg/Xorg (xorg_backtrace+0x52) [0x8024ff92]
(EE) 1: /usr/lib/xorg/Xorg (0x800ae000+0x1a63f2) [0x802543f2]
(EE) 2: (vdso) (__kernel_rt_sigreturn+0x0) [0xb7712c20]
(EE) 3: /usr/lib/xorg/Xorg (xf86PlatformMatchDriver+0xb5) [0x80149565]
(EE) 4: /usr/lib/xorg/Xorg (0x800ae000+0x9eb08) [0x8014cb08]
(EE) 5: /usr/lib/xorg/Xorg (0x800ae000+0x9ecd1) [0x8014ccd1]
(EE) 6: /usr/lib/xorg/Xorg (InitOutput+0x79a) [0x8012fa0a]
(EE) 7: /usr/lib/xorg/Xorg (0x800ae000+0x3ed81) [0x800ecd81]
(EE) 8: /usr/lib/xorg/Xorg (0x800ae000+0x28a3a) [0x800d6a3a]
(EE) 9: /lib/i386-linux-gnu/libc.so.6 (__libc_start_main+0xf7) [0xb71f9637]
(EE) 10: /usr/lib/xorg/Xorg (0x800ae000+0x28a78) [0x800d6a78]
(EE) 
(EE) Segmentation fault at address 0x28

# lsb_release -rd
Description:    Ubuntu 16.04.1 LTS
Release:        16.04

# apt-cache policy xserver-xorg-core
xserver-xorg-core:
  Installed: 2:1.18.4-0ubuntu0.1
  Candidate: 2:1.18.4-0ubuntu0.1
  Version table:
 *** 2:1.18.4-0ubuntu0.1 500
        500 http://archive.ubuntu.com/ubuntu xenial-updates/main i386 Packages
        100 /var/lib/dpkg/status
     2:1.18.3-1ubuntu2 500
        500 http://archive.ubuntu.com/ubuntu xenial/main i386 Packages

** Affects: xorg-server (Ubuntu)
     Importance: Undecided
         Status: New

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which is subscribed to xorg-server in Ubuntu.
https://bugs.launchpad.net/bugs/1635810

Title:
  Xorg crashes with SEGV failing to access /usr/share/X11/xorg.conf.d

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