no screens found! ubuntu进不了图形界面了

sudo apt-get install nvidia-331

[ 19837.786] 
X.Org X Server 1.15.1
Release Date: 2014-04-13
[ 19837.786] X Protocol Version 11, Revision 0
[ 19837.786] Build Operating System: Linux 3.2.0-37-generic x86_64 Ubuntu
[ 19837.787] Current Operating System: Linux sunshine-ubuntu 3.16.0-30-generic #40~14.04.1-Ubuntu SMP Thu Jan 15 17:43:14 UTC 2015 x86_64
[ 19837.787] Kernel command line: BOOT_IMAGE=/boot/vmlinuz-3.16.0-30-generic root=UUID=1652b135-84f2-4103-822b-85732e46676f ro recovery nomodeset
[ 19837.787] Build Date: 16 April 2014  01:36:29PM
[ 19837.787] xorg-server 2:1.15.1-0ubuntu2 (For technical support please see http://www.ubuntu.com/support) 
[ 19837.787] Current version of pixman: 0.30.2
[ 19837.787]    Before reporting problems, check http://wiki.x.org
        to make sure that you have the latest version.
[ 19837.787] Markers: (--) probed, (**) from config file, (==) default setting,
        (++) from command line, (!!) notice, (II) informational,
        (WW) warning, (EE) error, (NI) not implemented, (??) unknown.
[ 19837.787] (==) Log file: "/var/log/Xorg.0.log", Time: Wed Aug 17 23:07:10 2016
[ 19837.787] (II) Loader magic: 0x7f3335b58d60
[ 19837.787] (II) Module ABI versions:
[ 19837.787]    X.Org ANSI C Emulation: 0.4
[ 19837.787]    X.Org Video Driver: 15.0
[ 19837.787]    X.Org XInput driver : 20.0
[ 19837.787]    X.Org Server Extension : 8.0
[ 19837.789] (--) PCI:*(0:1:0:0) 1002:68d9:1462:2151 rev 0, Mem @ 0xd0000000/268435456, 0xfe620000/131072, I/O @ 0x0000e000/256, BIOS @ 0x????????/131072
[ 19837.790] List of video drivers:
[ 19837.790]    mach64
[ 19837.790] (II) LoadModule: "mach64"
[ 19837.790] (II) Loading /usr/lib/xorg/modules/drivers/mach64_drv.so
[ 19837.814] (II) Module mach64: vendor="X.Org Foundation"
[ 19837.814]    compiled for 1.15.0, module version = 6.9.4
[ 19837.814]    Module class: X.Org Video Driver
[ 19837.814]    ABI class: X.Org Video Driver, version 15.0
[ 19837.814] No devices to configure.  Configuration failed.

[ 19506.102] (II) UnloadModule: "fglrx"
[ 19506.102] (II) Unloading fglrx
[ 19506.102] (EE) Failed to load module "fglrx" (module does not exist, 0)
[ 19506.102] (II) LoadModule: "ati"
[ 19506.102] (WW) Warning, couldn‘t open module ati
[ 19506.102] (II) UnloadModule: "ati"
[ 19506.102] (II) Unloading ati
[ 19506.102] (EE) Failed to load module "ati" (module does not exist, 0)
[ 19506.102] (II) LoadModule: "modesetting"
[ 19506.102] (WW) Warning, couldn‘t open module modesetting
[ 19506.102] (II) UnloadModule: "modesetting"
[ 19506.102] (II) Unloading modesetting
[ 19506.102] (EE) Failed to load module "modesetting" (module does not exist, 0)
[ 19506.102] (II) LoadModule: "fbdev"
[ 19506.102] (WW) Warning, couldn‘t open module fbdev
[ 19506.102] (II) UnloadModule: "fbdev"
[ 19506.102] (II) Unloading fbdev
[ 19506.102] (EE) Failed to load module "fbdev" (module does not exist, 0)
[ 19506.102] (II) LoadModule: "vesa"
[ 19506.102] (WW) Warning, couldn‘t open module vesa
[ 19506.102] (II) UnloadModule: "vesa"
[ 19506.102] (II) Unloading vesa
[ 19506.102] (EE) Failed to load module "vesa" (module does not exist, 0)
[ 19506.102] (EE) No drivers available.
[ 19506.102] (EE) 
Fatal server error:
[ 19506.102] (EE) no screens found(EE) 
[ 19506.103] (EE) 
Please consult the The X.Org Foundation support 
         at http://wiki.x.org
 for help. 
[ 19506.103] (EE) Please also check the log file at "/var/log/Xorg.0.log" for additional information.
[ 19506.103] (EE)