0

This is my xorg.conf file:

Section "Screen"
    Identifier   "Screen0"
    Device       "Device0"
    Monitor      "Montior0"
    DefaultDepth 24
    Subsection   "Display"
        Depth      24
        Modes      "1024 x 768" "1280 x 960" "1366 x 768" "1280 x 1024" "1440 x 900" "1440 x 960" "1440 x 1080" "1600 x 1200" "1920 x 1080" "1920 x 1200"
    EndSubsection
EndSection

Section "Monitor"
    VendorName  "Monitor0"
    ModelName   "Model0"
    HorizSync   30 - 300
    VertRefresh 30 - 500
EndSection

        Modeline "1440x1080_60.00"  129.00  1440 1528 1680 1920  1080 1083 1087 1120 -hsync +vsync

When I reboot my PC, I find that I'm unable to get a graphical login.
The error I get is along the lines of:

Error in xorg.conf
This section must have an Identifier line.
EE problem/error parsing the config line
Fatal server error: no screens found

What's the reason for this and how can solve it?
All questions on this have no solutions...

Output of /var/log/Xorg.0.log:

[    34.304] 
X.Org X Server 1.15.1
Release Date: 2014-04-13
[    34.304] X Protocol Version 11, Revision 0
[    34.304] Build Operating System: Linux 3.2.0-76-generic x86_64 Ubuntu
[    34.304] Current Operating System: Linux pointcarre-OptiPlex-755 3.13.0-24-generic #47-Ubuntu SMP Fri May 2 23:30:00 UTC 2014 x86_64
[    34.304] Kernel command line: BOOT_IMAGE=/boot/vmlinuz-3.13.0-24-generic root=UUID=94e3a36a-e676-4f71-b4fd-1edcc90700da ro quiet splash
[    34.304] Build Date: 12 February 2015  02:49:29PM
[    34.304] xorg-server 2:1.15.1-0ubuntu2.7 (For technical support please see http://www.ubuntu.com/support) 
[    34.304] Current version of pixman: 0.30.2
[    34.304]    Before reporting problems, check http://wiki.x.org
    to make sure that you have the latest version.
[    34.304] Markers: (--) probed, (**) from config file, (==) default setting,
    (++) from command line, (!!) notice, (II) informational,
    (WW) warning, (EE) error, (NI) not implemented, (??) unknown.
[    34.304] (==) Log file: "/var/log/Xorg.0.log", Time: Fri Nov 13 21:00:30 2015
[    34.390] (==) Using system config directory "/usr/share/X11/xorg.conf.d"
[    34.427] (==) No Layout section.  Using the first Screen section.
[    34.427] (==) No screen section available. Using defaults.
[    34.427] (**) |-->Screen "Default Screen Section" (0)
[    34.427] (**) |   |-->Monitor ""
[    34.427] (==) No monitor specified for screen "Default Screen Section".
    Using a default monitor configuration.
[    34.427] (==) Automatically adding devices
[    34.427] (==) Automatically enabling devices
[    34.427] (==) Automatically adding GPU devices
[    34.427] (WW) The directory "/usr/share/fonts/X11/cyrillic" does not exist.
[    34.427]    Entry deleted from font path.
[    34.427] (WW) The directory "/usr/share/fonts/X11/100dpi/" does not exist.
[    34.427]    Entry deleted from font path.
[    34.427] (WW) The directory "/usr/share/fonts/X11/75dpi/" does not exist.
[    34.427]    Entry deleted from font path.
[    34.427] (WW) The directory "/usr/share/fonts/X11/100dpi" does not exist.
[    34.427]    Entry deleted from font path.
[    34.427] (WW) The directory "/usr/share/fonts/X11/75dpi" does not exist.
[    34.427]    Entry deleted from font path.
[    34.428] (==) FontPath set to:
    /usr/share/fonts/X11/misc,
    /usr/share/fonts/X11/Type1,
    built-ins
[    34.428] (==) ModulePath set to "/usr/lib/x86_64-linux-gnu/xorg/extra-modules,/usr/lib/xorg/extra-modules,/usr/lib/xorg/modules"
[    34.428] (II) The server relies on udev to provide the list of input devices.
    If no devices become available, reconfigure udev or disable AutoAddDevices.
[    34.428] (II) Loader magic: 0x7f4070706d40
[    34.428] (II) Module ABI versions:
[    34.428]    X.Org ANSI C Emulation: 0.4
[    34.428]    X.Org Video Driver: 15.0
[    34.428]    X.Org XInput driver : 20.0
[    34.428]    X.Org Server Extension : 8.0
[    34.428] (II) xfree86: Adding drm device (/dev/dri/card0)
[    34.429] (--) PCI:*(0:1:0:0) 10de:0a65:1043:848f rev 162, Mem @ 0xfd000000/16777216, 0xc0000000/268435456, 0xd0000000/33554432, I/O @ 0x0000dc80/128, BIOS @ 0x????????/524288
[    34.429] Initializing built-in extension Generic Event Extension
[    34.429] Initializing built-in extension SHAPE
[    34.429] Initializing built-in extension MIT-SHM
[    34.429] Initializing built-in extension XInputExtension
[    34.429] Initializing built-in extension XTEST
[    34.429] Initializing built-in extension BIG-REQUESTS
[    34.429] Initializing built-in extension SYNC
[    34.429] Initializing built-in extension XKEYBOARD
[    34.429] Initializing built-in extension XC-MISC
[    34.430] Initializing built-in extension SECURITY
[    34.430] Initializing built-in extension XINERAMA
[    34.430] Initializing built-in extension XFIXES
[    34.430] Initializing built-in extension RENDER
[    34.430] Initializing built-in extension RANDR
[    34.430] Initializing built-in extension COMPOSITE
[    34.430] Initializing built-in extension DAMAGE
[    34.430] Initializing built-in extension MIT-SCREEN-SAVER
[    34.430] Initializing built-in extension DOUBLE-BUFFER
[    34.430] Initializing built-in extension RECORD
[    34.430] Initializing built-in extension DPMS
[    34.430] Initializing built-in extension Present
[    34.430] Initializing built-in extension DRI3
[    34.430] Initializing built-in extension X-Resource
[    34.430] Initializing built-in extension XVideo
[    34.430] Initializing built-in extension XVideo-MotionCompensation
[    34.430] Initializing built-in extension SELinux
[    34.430] Initializing built-in extension XFree86-VidModeExtension
[    34.430] Initializing built-in extension XFree86-DGA
[    34.430] Initializing built-in extension XFree86-DRI
[    34.430] Initializing built-in extension DRI2
[    34.430] (WW) "glamoregl" will not be loaded unless you've specified it to be loaded elsewhere.
[    34.430] (II) "glx" will be loaded by default.
[    34.430] (WW) "xmir" is not to be loaded by default. Skipping.
[    34.430] (II) LoadModule: "glx"
[    34.430] (II) Loading /usr/lib/x86_64-linux-gnu/xorg/extra-modules/libglx.so
[    34.456] (II) Module glx: vendor="NVIDIA Corporation"
[    34.456]    compiled for 4.0.2, module version = 1.0.0
[    34.456]    Module class: X.Org Server Extension
[    34.456] (II) NVIDIA GLX Module  340.93  Wed Aug 19 16:23:51 PDT 2015
[    34.456] Loading extension GLX
[    34.456] (==) Matched nvidia as autoconfigured driver 0
[    34.456] (==) Matched nouveau as autoconfigured driver 1
[    34.456] (==) Matched nvidia as autoconfigured driver 2
[    34.456] (==) Matched nouveau as autoconfigured driver 3
[    34.456] (==) Matched modesetting as autoconfigured driver 4
[    34.456] (==) Matched fbdev as autoconfigured driver 5
[    34.456] (==) Matched vesa as autoconfigured driver 6
[    34.456] (==) Assigned the driver to the xf86ConfigLayout
[    34.456] (II) LoadModule: "nvidia"
[    34.456] (II) Loading /usr/lib/x86_64-linux-gnu/xorg/extra-modules/nvidia_drv.so
[    34.457] (II) Module nvidia: vendor="NVIDIA Corporation"
[    34.457]    compiled for 4.0.2, module version = 1.0.0
[    34.457]    Module class: X.Org Video Driver
[    34.457] (II) LoadModule: "nouveau"
[    34.457] (II) Loading /usr/lib/xorg/modules/drivers/nouveau_drv.so
[    34.472] (II) Module nouveau: vendor="X.Org Foundation"
[    34.472]    compiled for 1.15.0, module version = 1.0.10
[    34.472]    Module class: X.Org Video Driver
[    34.473]    ABI class: X.Org Video Driver, version 15.0
[    34.473] (II) LoadModule: "modesetting"
[    34.473] (II) Loading /usr/lib/xorg/modules/drivers/modesetting_drv.so
[    34.473] (II) Module modesetting: vendor="X.Org Foundation"
[    34.473]    compiled for 1.15.0, module version = 0.8.1
[    34.473]    Module class: X.Org Video Driver
[    34.473]    ABI class: X.Org Video Driver, version 15.0
[    34.473] (II) LoadModule: "fbdev"
[    34.473] (II) Loading /usr/lib/xorg/modules/drivers/fbdev_drv.so
[    34.473] (II) Module fbdev: vendor="X.Org Foundation"
[    34.473]    compiled for 1.15.0, module version = 0.4.4
[    34.473]    Module class: X.Org Video Driver
[    34.473]    ABI class: X.Org Video Driver, version 15.0
[    34.473] (II) LoadModule: "vesa"
[    34.474] (II) Loading /usr/lib/xorg/modules/drivers/vesa_drv.so
[    34.474] (II) Module vesa: vendor="X.Org Foundation"
[    34.474]    compiled for 1.15.0, module version = 2.3.3
[    34.474]    Module class: X.Org Video Driver
[    34.474]    ABI class: X.Org Video Driver, version 15.0
[    34.474] (II) NVIDIA dlloader X Driver  340.93  Wed Aug 19 16:01:53 PDT 2015
[    34.474] (II) NVIDIA Unified Driver for all Supported NVIDIA GPUs
[    34.474] (II) NOUVEAU driver Date:   Thu Nov 7 14:56:48 2013 +1000
[    34.474] (II) NOUVEAU driver for NVIDIA chipset families :
[    34.474]    RIVA TNT        (NV04)
[    34.474]    RIVA TNT2       (NV05)
[    34.474]    GeForce 256     (NV10)
[    34.474]    GeForce 2       (NV11, NV15)
[    34.474]    GeForce 4MX     (NV17, NV18)
[    34.474]    GeForce 3       (NV20)
[    34.474]    GeForce 4Ti     (NV25, NV28)
[    34.474]    GeForce FX      (NV3x)
[    34.474]    GeForce 6       (NV4x)
[    34.474]    GeForce 7       (G7x)
[    34.474]    GeForce 8       (G8x)
[    34.474]    GeForce GTX 200 (NVA0)
[    34.474]    GeForce GTX 400 (NVC0)
[    34.474] (II) modesetting: Driver for Modesetting Kernel Drivers: kms
[    34.474] (II) FBDEV: driver for framebuffer: fbdev
[    34.474] (II) VESA: driver for VESA chipsets: vesa
[    34.474] (++) using VT number 8

[    34.477] (II) Loading sub module "fb"
[    34.477] (II) LoadModule: "fb"
[    34.532] (II) Loading /usr/lib/xorg/modules/libfb.so
[    34.532] (II) Module fb: vendor="X.Org Foundation"
[    34.532]    compiled for 1.15.1, module version = 1.0.0
[    34.532]    ABI class: X.Org ANSI C Emulation, version 0.4
[    34.532] (WW) Unresolved symbol: fbGetGCPrivateKey
[    34.532] (II) Loading sub module "wfb"
[    34.532] (II) LoadModule: "wfb"
[    34.533] (II) Loading /usr/lib/xorg/modules/libwfb.so
[    34.533] (II) Module wfb: vendor="X.Org Foundation"
[    34.533]    compiled for 1.15.1, module version = 1.0.0
[    34.533]    ABI class: X.Org ANSI C Emulation, version 0.4
[    34.533] (II) Loading sub module "ramdac"
[    34.533] (II) LoadModule: "ramdac"
[    34.533] (II) Module "ramdac" already built-in
[    34.533] (WW) Falling back to old probe method for modesetting
[    34.534] (WW) Falling back to old probe method for fbdev
[    34.534] (II) Loading sub module "fbdevhw"
[    34.534] (II) LoadModule: "fbdevhw"
[    34.534] (II) Loading /usr/lib/xorg/modules/libfbdevhw.so
[    34.534] (II) Module fbdevhw: vendor="X.Org Foundation"
[    34.534]    compiled for 1.15.1, module version = 0.0.2
[    34.534]    ABI class: X.Org Video Driver, version 15.0
[    34.534] (EE) open /dev/fb0: No such file or directory
[    34.534] (WW) Falling back to old probe method for vesa
[    34.534] (II) NVIDIA(0): Creating default Display subsection in Screen section
    "Default Screen Section" for depth/fbbpp 24/32
[    34.534] (==) NVIDIA(0): Depth 24, (==) framebuffer bpp 32
[    34.534] (==) NVIDIA(0): RGB weight 888
[    34.534] (==) NVIDIA(0): Default visual is TrueColor
[    34.534] (==) NVIDIA(0): Using gamma correction (1.0, 1.0, 1.0)
[    34.534] (**) NVIDIA(0): Enabling 2D acceleration
[    35.126] (II) NVIDIA(0): Display (Samsung SyncMaster (DFP-0)) does not support NVIDIA
[    35.126] (II) NVIDIA(0):     3D Vision stereo.
[    35.126] (II) NVIDIA(GPU-0): Found DRM driver nvidia-drm (20150116)
[    35.127] (II) NVIDIA(0): NVIDIA GPU GeForce 210 (GT218) at PCI:1:0:0 (GPU-0)
[    35.127] (--) NVIDIA(0): Memory: 1048576 kBytes
[    35.127] (--) NVIDIA(0): VideoBIOS: 70.18.64.00.05
[    35.127] (II) NVIDIA(0): Detected PCI Express Link width: 16X
[    35.129] (--) NVIDIA(0): Valid display device(s) on GeForce 210 at PCI:1:0:0
[    35.129] (--) NVIDIA(0):     CRT-0
[    35.129] (--) NVIDIA(0):     CRT-1
[    35.129] (--) NVIDIA(0):     Samsung SyncMaster (DFP-0) (boot, connected)
[    35.129] (--) NVIDIA(0):     DFP-1
[    35.129] (--) NVIDIA(GPU-0): CRT-0: 400.0 MHz maximum pixel clock
[    35.129] (--) NVIDIA(GPU-0): CRT-1: 400.0 MHz maximum pixel clock
[    35.129] (--) NVIDIA(0): Samsung SyncMaster (DFP-0): Internal TMDS
[    35.129] (--) NVIDIA(GPU-0): Samsung SyncMaster (DFP-0): 330.0 MHz maximum pixel clock
[    35.129] (--) NVIDIA(0): DFP-1: Internal TMDS
[    35.129] (--) NVIDIA(GPU-0): DFP-1: 165.0 MHz maximum pixel clock
[    35.129] (**) NVIDIA(0): Using HorizSync/VertRefresh ranges from the EDID for display
[    35.129] (**) NVIDIA(0):     device Samsung SyncMaster (DFP-0) (Using EDID frequencies
[    35.129] (**) NVIDIA(0):     has been enabled on all display devices.)
[    35.132] (==) NVIDIA(0): 
[    35.132] (==) NVIDIA(0): No modes were requested; the default mode "nvidia-auto-select"
[    35.132] (==) NVIDIA(0):     will be used as the requested mode.
[    35.132] (==) NVIDIA(0): 
[    35.132] (II) NVIDIA(0): Validated MetaModes:
[    35.132] (II) NVIDIA(0):     "DFP-0:nvidia-auto-select"
[    35.132] (II) NVIDIA(0): Virtual screen size determined to be 1280 x 1024
[    35.156] (--) NVIDIA(0): DPI set to (95, 96); computed from "UseEdidDpi" X config
[    35.156] (--) NVIDIA(0):     option
[    35.156] (II) UnloadModule: "nouveau"
[    35.156] (II) Unloading nouveau
[    35.156] (II) UnloadModule: "modesetting"
[    35.156] (II) Unloading modesetting
[    35.156] (II) UnloadModule: "fbdev"
[    35.157] (II) Unloading fbdev
[    35.157] (II) UnloadSubModule: "fbdevhw"
[    35.157] (II) Unloading fbdevhw
[    35.157] (II) UnloadModule: "vesa"
[    35.157] (II) Unloading vesa
[    35.157] (--) Depth 24 pixmap format is 32 bpp
[    35.157] (II) NVIDIA: Using 768.00 MB of virtual memory for indirect memory access.
[    35.161] (II) NVIDIA(0): Setting mode "DFP-0:nvidia-auto-select"
[    35.212] Loading extension NV-GLX
[    35.237] (==) NVIDIA(0): Disabling shared memory pixmaps
[    35.237] (==) NVIDIA(0): Backing store enabled
[    35.237] (==) NVIDIA(0): Silken mouse enabled
[    35.237] (==) NVIDIA(0): DPMS enabled
[    35.237] Loading extension NV-CONTROL
[    35.238] Loading extension XINERAMA
[    35.238] (II) Loading sub module "dri2"
[    35.238] (II) LoadModule: "dri2"
[    35.238] (II) Module "dri2" already built-in
[    35.238] (II) NVIDIA(0): [DRI2] Setup complete
[    35.238] (II) NVIDIA(0): [DRI2]   VDPAU driver: nvidia
[    35.238] (--) RandR disabled
[    35.244] (II) SELinux: Disabled on system
[    35.245] (II) Initializing extension GLX
[    35.261] (II) XKB: reuse xkmfile /var/lib/xkb/server-B20D7FC79C7F597315E3E501AEF10E0D866E8E92.xkm
[    35.265] (II) config/udev: Adding input device Power Button (/dev/input/event1)
[    35.265] (**) Power Button: Applying InputClass "evdev keyboard catchall"
[    35.265] (II) LoadModule: "evdev"
[    35.265] (II) Loading /usr/lib/xorg/modules/input/evdev_drv.so
[    35.285] (II) Module evdev: vendor="X.Org Foundation"
[    35.285]    compiled for 1.15.0, module version = 2.8.2
[    35.285]    Module class: X.Org XInput Driver
[    35.285]    ABI class: X.Org XInput driver, version 20.0
[    35.285] (II) Using input driver 'evdev' for 'Power Button'
[    35.285] (**) Power Button: always reports core events
[    35.285] (**) evdev: Power Button: Device: "/dev/input/event1"
[    35.285] (--) evdev: Power Button: Vendor 0 Product 0x1
[    35.285] (--) evdev: Power Button: Found keys
[    35.285] (II) evdev: Power Button: Configuring as keyboard
[    35.285] (**) Option "config_info" "udev:/sys/devices/LNXSYSTM:00/LNXPWRBN:00/input/input1/event1"
[    35.285] (II) XINPUT: Adding extended input device "Power Button" (type: KEYBOARD, id 6)
[    35.285] (**) Option "xkb_rules" "evdev"
[    35.285] (**) Option "xkb_model" "pc105"
[    35.285] (**) Option "xkb_layout" "gb"
[    35.287] (II) XKB: reuse xkmfile /var/lib/xkb/server-2B4266AA55228AE7D9557A18F1965DBA19850816.xkm
[    35.288] (II) config/udev: Adding input device Power Button (/dev/input/event0)
[    35.288] (**) Power Button: Applying InputClass "evdev keyboard catchall"
[    35.288] (II) Using input driver 'evdev' for 'Power Button'
[    35.288] (**) Power Button: always reports core events
[    35.288] (**) evdev: Power Button: Device: "/dev/input/event0"
[    35.288] (--) evdev: Power Button: Vendor 0 Product 0x1
[    35.288] (--) evdev: Power Button: Found keys
[    35.288] (II) evdev: Power Button: Configuring as keyboard
[    35.288] (**) Option "config_info" "udev:/sys/devices/LNXSYSTM:00/device:00/PNP0C0C:00/input/input0/event0"
[    35.288] (II) XINPUT: Adding extended input device "Power Button" (type: KEYBOARD, id 7)
[    35.288] (**) Option "xkb_rules" "evdev"
[    35.288] (**) Option "xkb_model" "pc105"
[    35.288] (**) Option "xkb_layout" "gb"
[    35.288] (II) config/udev: Adding drm device (/dev/dri/card0) card0 /sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0/drm/card0
[    35.288] (II) config/udev: Ignoring already known drm device (/dev/dri/card0)
[    35.289] (II) config/udev: Adding input device HDA NVidia HDMI/DP,pcm=3 (/dev/input/event12)
[    35.289] (II) No input driver specified, ignoring this device.
[    35.289] (II) This device may have been added with another device file.
[    35.289] (II) config/udev: Adding input device HDA NVidia HDMI/DP,pcm=7 (/dev/input/event11)
[    35.289] (II) No input driver specified, ignoring this device.
[    35.289] (II) This device may have been added with another device file.
[    35.290] (II) config/udev: Adding input device HDA NVidia HDMI/DP,pcm=8 (/dev/input/event10)
[    35.290] (II) No input driver specified, ignoring this device.
[    35.290] (II) This device may have been added with another device file.
[    35.290] (II) config/udev: Adding input device HDA NVidia HDMI/DP,pcm=9 (/dev/input/event9)
[    35.290] (II) No input driver specified, ignoring this device.
[    35.290] (II) This device may have been added with another device file.
[    35.290] (II) config/udev: Adding input device HDA Intel Line Out (/dev/input/event6)
[    35.290] (II) No input driver specified, ignoring this device.
[    35.290] (II) This device may have been added with another device file.
[    35.291] (II) config/udev: Adding input device HDA Intel Front Headphone (/dev/input/event5)
[    35.291] (II) No input driver specified, ignoring this device.
[    35.291] (II) This device may have been added with another device file.
[    35.291] (II) config/udev: Adding input device HDA Intel Mic (/dev/input/event8)
[    35.291] (II) No input driver specified, ignoring this device.
[    35.291] (II) This device may have been added with another device file.
[    35.291] (II) config/udev: Adding input device HDA Intel Line (/dev/input/event7)
[    35.291] (II) No input driver specified, ignoring this device.
[    35.291] (II) This device may have been added with another device file.
[    35.292] (II) config/udev: Adding input device USB OPTICAL MOUSE (/dev/input/event2)
[    35.292] (**) USB OPTICAL MOUSE: Applying InputClass "evdev pointer catchall"
[    35.292] (II) Using input driver 'evdev' for 'USB OPTICAL MOUSE'
[    35.292] (**) USB OPTICAL MOUSE: always reports core events
[    35.292] (**) evdev: USB OPTICAL MOUSE: Device: "/dev/input/event2"
[    35.292] (--) evdev: USB OPTICAL MOUSE: Vendor 0x93a Product 0x2516
[    35.292] (--) evdev: USB OPTICAL MOUSE: Found 3 mouse buttons
[    35.292] (--) evdev: USB OPTICAL MOUSE: Found scroll wheel(s)
[    35.292] (--) evdev: USB OPTICAL MOUSE: Found relative axes
[    35.292] (--) evdev: USB OPTICAL MOUSE: Found x and y relative axes
[    35.292] (II) evdev: USB OPTICAL MOUSE: Configuring as mouse
[    35.292] (II) evdev: USB OPTICAL MOUSE: Adding scrollwheel support
[    35.292] (**) evdev: USB OPTICAL MOUSE: YAxisMapping: buttons 4 and 5
[    35.292] (**) evdev: USB OPTICAL MOUSE: EmulateWheelButton: 4, EmulateWheelInertia: 10, EmulateWheelTimeout: 200
[    35.292] (**) Option "config_info" "udev:/sys/devices/pci0000:00/0000:00:1d.2/usb7/7-1/7-1:1.0/input/input5/event2"
[    35.292] (II) XINPUT: Adding extended input device "USB OPTICAL MOUSE" (type: MOUSE, id 8)
[    35.292] (II) evdev: USB OPTICAL MOUSE: initialized for relative axes.
[    35.292] (**) USB OPTICAL MOUSE: (accel) keeping acceleration scheme 1
[    35.292] (**) USB OPTICAL MOUSE: (accel) acceleration profile 0
[    35.292] (**) USB OPTICAL MOUSE: (accel) acceleration factor: 2.000
[    35.292] (**) USB OPTICAL MOUSE: (accel) acceleration threshold: 4
[    35.293] (II) config/udev: Adding input device USB OPTICAL MOUSE (/dev/input/mouse0)
[    35.293] (II) No input driver specified, ignoring this device.
[    35.293] (II) This device may have been added with another device file.
[    35.293] (II) config/udev: Adding input device Chicony USB Keyboard (/dev/input/event3)
[    35.293] (**) Chicony USB Keyboard: Applying InputClass "evdev keyboard catchall"
[    35.293] (II) Using input driver 'evdev' for 'Chicony USB Keyboard'
[    35.293] (**) Chicony USB Keyboard: always reports core events
[    35.293] (**) evdev: Chicony USB Keyboard: Device: "/dev/input/event3"
[    35.293] (--) evdev: Chicony USB Keyboard: Vendor 0x4f2 Product 0x402
[    35.293] (--) evdev: Chicony USB Keyboard: Found keys
[    35.293] (II) evdev: Chicony USB Keyboard: Configuring as keyboard
[    35.293] (**) Option "config_info" "udev:/sys/devices/pci0000:00/0000:00:1d.2/usb7/7-2/7-2:1.0/input/input6/event3"
[    35.293] (II) XINPUT: Adding extended input device "Chicony USB Keyboard" (type: KEYBOARD, id 9)
[    35.293] (**) Option "xkb_rules" "evdev"
[    35.293] (**) Option "xkb_model" "pc105"
[    35.293] (**) Option "xkb_layout" "gb"
[    35.294] (II) config/udev: Adding input device Chicony USB Keyboard (/dev/input/event4)
[    35.294] (**) Chicony USB Keyboard: Applying InputClass "evdev keyboard catchall"
[    35.294] (II) Using input driver 'evdev' for 'Chicony USB Keyboard'
[    35.294] (**) Chicony USB Keyboard: always reports core events
[    35.294] (**) evdev: Chicony USB Keyboard: Device: "/dev/input/event4"
[    35.294] (--) evdev: Chicony USB Keyboard: Vendor 0x4f2 Product 0x402
[    35.294] (--) evdev: Chicony USB Keyboard: Found keys
[    35.294] (II) evdev: Chicony USB Keyboard: Configuring as keyboard
[    35.294] (**) Option "config_info" "udev:/sys/devices/pci0000:00/0000:00:1d.2/usb7/7-2/7-2:1.1/input/input7/event4"
[    35.294] (II) XINPUT: Adding extended input device "Chicony USB Keyboard" (type: KEYBOARD, id 10)
[    35.294] (**) Option "xkb_rules" "evdev"
[    35.294] (**) Option "xkb_model" "pc105"
[    35.294] (**) Option "xkb_layout" "gb"
[   111.577] (II) NVIDIA(GPU-0): Display (Samsung SyncMaster (DFP-0)) does not support NVIDIA
[   111.577] (II) NVIDIA(GPU-0):     3D Vision stereo.
[   117.074] (II) NVIDIA(GPU-0): Display (Samsung SyncMaster (DFP-0)) does not support NVIDIA
[   117.074] (II) NVIDIA(GPU-0):     3D Vision stereo.
[   117.811] (II) NVIDIA(GPU-0): Display (Samsung SyncMaster (DFP-0)) does not support NVIDIA
[   117.811] (II) NVIDIA(GPU-0):     3D Vision stereo.
[   118.912] (II) XKB: reuse xkmfile /var/lib/xkb/server-7996F6726817F73651B9DE0FDA11E35FC4524568.xkm
[   119.477] (II) XKB: reuse xkmfile /var/lib/xkb/server-F4830027FD6DFAF7D5CB4AF430AE062CB8989800.xkm
[   139.935] (II) NVIDIA(GPU-0): Display (Samsung SyncMaster (DFP-0)) does not support NVIDIA
[   139.935] (II) NVIDIA(GPU-0):     3D Vision stereo.
[   150.687] (II) XKB: reuse xkmfile /var/lib/xkb/server-F4830027FD6DFAF7D5CB4AF430AE062CB8989800.xkm
[   150.691] (II) XKB: reuse xkmfile /var/lib/xkb/server-F4830027FD6DFAF7D5CB4AF430AE062CB8989800.xkm
[   150.695] (II) XKB: reuse xkmfile /var/lib/xkb/server-F4830027FD6DFAF7D5CB4AF430AE062CB8989800.xkm
[   150.698] (II) XKB: reuse xkmfile /var/lib/xkb/server-F4830027FD6DFAF7D5CB4AF430AE062CB8989800.xkm
[   150.702] (II) XKB: reuse xkmfile /var/lib/xkb/server-F4830027FD6DFAF7D5CB4AF430AE062CB8989800.xkm
[   150.706] (II) XKB: reuse xkmfile /var/lib/xkb/server-F4830027FD6DFAF7D5CB4AF430AE062CB8989800.xkm
  • Can you add the output of cat /var/log/Xorg.0.log? – kos Nov 13 '15 at 11:22
  • @kos updated answer – TellMeWhy Nov 13 '15 at 21:37
  • I will not mark as duplicate, because between 12.04 and your version (I'm going to guess you aren't using 12.04) there may be changes in Xorg, however I would recommend attempting what is described here: askubuntu.com/questions/167000/… – David Nov 13 '15 at 22:57
1
+50

The error is exactly what it says. One of your sections (in the xorg.conf file) does not have an Identifier line.

The Section "Monitor" section has VendorName, ModelName, HorizSync and VertRefresh lines but no Identifier.

Add the following line directly after Section "Monitor" and before VendorName:
Identifier "Monitor0"

Your Section "Screen" references a Monitor "Montior0" (sic). Therefore it needs to find a Monitor with the Identifier "Montior0" (sic). It also highlights a possible typo there too.

Therefore, change "Montior0" to "Monitor0" in the Section "Screen" and add the Identifier "Monitor0" line in the Section "Monitor". Hopefully that should do it.

In case you (or future readers of this post) don't know how: Edit the xorg.conf file with the following command:
sudo nano /etc/X11/xorg.conf

1

To expand on my comment into a more accessible answer, there are 2 steps to attempt to fix this.

  1. Move (Delete) ~/.config/monitors.xml
    Step 1: Since we cannot use a GUI (Graphical User Interface) we will have to boot into Grub.
    Step 2: Once in Grub, enable networking, then drop to shell prompt.
    Step 3: Once in Grub do mv ~/.config/monitors.xml ~/.config/old_monitors.xml Step 4: Move on to the second step we will need to do (Re-installing xorg) <>
  2. Re-install Xorg
    Pre-steps: Repeat steps 1 & 2 from above, to get to shell.
    Step 1: Do apt-get purge xauth
    Step 2: Do apt-get autoremove
    Step 3: Do apt-get install xauth
    Step 4: Do reboot now

Done! Enjoy your new working Xorg installation!

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