Ubuntu 18.04 卡在引导分段错误 XServer

我有一台运行 Ubuntu 18.04 LTS 的联想 E570 机器（带有 Nvidia GTX 950M）。直到今天早上 Ubuntu 启动卡在Started Gnome Display Manager. 有趣的是，如果我进入恢复模式然后恢复正常启动，我的桌面环境是可以访问的。

脚步

遇到这个错误后，我尝试了几件事：

1. 根据这个答案，我删除了 Nvidia 驱动程序。
2. 删除了 gdm3（Gnome 桌面管理器）并重新安装
3. 安装并尝试了不同的桌面管理器，包括 LightDM、SliM（并一一使它们成为主要的桌面管理器），但这也不起作用（附上日志）。
4. 从第3步的日志中发现这是X.Org X Server的问题（附上日志）。删除并重新安装该软件包xserver-xorg
5. 从 Ubuntu 软件更新管理器安装 Nvidia 驱动程序

以上选项似乎都不适合我。我在这里缺少什么？

我的 Linux 内核是 4.15.0-109-generic

日志

1. /var/log/lightdm/lightdm.log

[+24.84s] DEBUG: Session pid=1658: Running command /usr/sbin/lightdm-session env 
GNOME_SHELL_SESSION_MODE=ubuntu gnome-session --session=ubuntu
[+24.84s] DEBUG: Creating shared data directory /var/lib/lightdm-data/osama
[+24.84s] DEBUG: Session pid=1658: Logging to .xsession-errors
[+24.92s] DEBUG: Activating VT 7
[+24.92s] DEBUG: Activating login1 session c2
[+24.92s] DEBUG: Seat seat0 changes active session to c2
[+24.92s] DEBUG: Session c2 is already active
[+272.84s] DEBUG: Got signal 15 from process 1
[+272.84s] DEBUG: Caught Terminated signal, shutting down
[+272.84s] DEBUG: Stopping display manager
[+272.84s] DEBUG: Seat seat0: Stopping
[+272.84s] DEBUG: Seat seat0: Stopping display server
[+272.84s] DEBUG: Sending signal 15 to process 1232
[+272.84s] DEBUG: Seat seat0: Stopping session
[+272.84s] DEBUG: Terminating login1 session c2
[+272.85s] DEBUG: Session pid=1658: Sending SIGTERM
[+272.93s] DEBUG: Session pid=1658: Exited with return value 0
[+272.93s] DEBUG: Seat seat0: Session stopped
[+272.93s] DEBUG: Seat seat0 changes active session to 
[+273.17s] DEBUG: Process 1232 exited with return value 0
[+273.17s] DEBUG: XServer 0: X server stopped
[+273.17s] DEBUG: Releasing VT 7
[+273.17s] DEBUG: XServer 0: Removing X server authority /var/run/lightdm/root/:0
[+273.17s] DEBUG: Seat seat0: Display server stopped
[+273.17s] DEBUG: Seat seat0: Stopped
[+273.17s] DEBUG: Display manager stopped
[+273.17s] DEBUG: Stopping daemon
[+273.17s] DEBUG: Exiting with return value 0

2. /var/log/slim.log

slim: waiting for X server to begin accepting connections Giving up. slim: unable to connect to X server


slim: waiting for X server to begin accepting connections Giving up. slim: unable to connect to X server

3. /var/log/Xorg.0.log.old

[    13.050] (II) Module glx: vendor="X.Org Foundation"
[    13.050]  compiled for 1.19.6, module version = 1.0.0
[    13.050]  ABI class: X.Org Server Extension, version 10.0
[    13.050] (==) Matched modesetting as autoconfigured driver 0
[    13.050] (==) Matched fbdev as autoconfigured driver 1
[    13.050] (==) Matched vesa as autoconfigured driver 2
[    13.050] (==) Assigned the driver to the xf86ConfigLayout
[    13.050] (II) LoadModule: "modesetting"
[    13.050] (II) Loading /usr/lib/xorg/modules/drivers/modesetting_drv.so
[    13.050] (II) Module modesetting: vendor="X.Org Foundation"
[    13.050]  compiled for 1.19.6, module version = 1.19.6
[    13.050]  Module class: X.Org Video Driver
[    13.050]  ABI class: X.Org Video Driver, version 23.0
[    13.050] (II) LoadModule: "fbdev"
[    13.050] (II) Loading /usr/lib/xorg/modules/drivers/fbdev_drv.so
[    13.050] (II) Module fbdev: vendor="X.Org Foundation"
[    13.050]  compiled for 1.19.3, module version = 0.4.4
[    13.050]  Module class: X.Org Video Driver
[    13.050]  ABI class: X.Org Video Driver, version 23.0
[    13.050] (II) LoadModule: "vesa"
[    13.051] (II) Loading /usr/lib/xorg/modules/drivers/vesa_drv.so
[    13.051] (II) Module vesa: vendor="X.Org Foundation"
[    13.051]  compiled for 1.19.3, module version = 2.3.4
[    13.051]  Module class: X.Org Video Driver
[    13.051]  ABI class: X.Org Video Driver, version 23.0
[    13.051] (II) modesetting: Driver for Modesetting Kernel Drivers: kms
[    13.051] (II) FBDEV: driver for framebuffer: fbdev
[    13.051] (II) VESA: driver for VESA chipsets: vesa
[    13.079] (II) modeset(0): using drv /dev/dri/card0
[    13.079] (WW) Falling back to old probe method for fbdev
[    13.079] (II) Loading sub module "fbdevhw"
[    13.079] (II) LoadModule: "fbdevhw"
[    13.080] (II) Loading /usr/lib/xorg/modules/libfbdevhw.so
[    13.080] (II) Module fbdevhw: vendor="X.Org Foundation"
[    13.080]  compiled for 1.19.6, module version = 0.0.2
[    13.080]  ABI class: X.Org Video Driver, version 23.0
[    13.080] (WW) Falling back to old probe method for vesa
[    13.080] (II) modeset(0): Creating default Display subsection in Screen section
  "Default Screen Section" for depth/fbbpp 24/32
[    13.080] (==) modeset(0): Depth 24, (==) framebuffer bpp 32
[    13.080] (==) modeset(0): RGB weight 888
[    13.080] (==) modeset(0): Default visual is TrueColor
[    13.080] (II) Loading sub module "glamoregl"
[    13.080] (II) LoadModule: "glamoregl"
[    13.080] (II) Loading /usr/lib/xorg/modules/libglamoregl.so
[    13.083] (II) Module glamoregl: vendor="X.Org Foundation"
[    13.083]  compiled for 1.19.6, module version = 1.0.0
[    13.083]  ABI class: X.Org ANSI C Emulation, version 0.4
[    13.083] (II) glamor: OpenGL accelerated X.org driver based.
[    13.101] (EE) 
[    13.101] (EE) Backtrace:
[    13.101] (EE) 0: /usr/lib/xorg/Xorg (xorg_backtrace+0x4d) [0x55f3d6f7f8cd]
[    13.101] (EE) 1: /usr/lib/xorg/Xorg (0x55f3d6dc7000+0x1bc669) [0x55f3d6f83669]
[    13.101] (EE) 2: /lib/x86_64-linux-gnu/libpthread.so.0 (0x7f8341fac000+0x128a0) [0x7f8341fbe8a0]

>     [    13.101] (EE) 3: /usr/lib/x86_64-linux-gnu/libEGL_mesa.so.0 (0x7f83393f3000+0x129cc) [0x7f83394059cc]
>     [    13.101] (EE) 4: /usr/lib/x86_64-linux-gnu/libEGL_mesa.so.0 (0x7f83393f3000+0x1b19e) [0x7f833940e19e]
>     [    13.101] (EE) 5: /usr/lib/x86_64-linux-gnu/libEGL_mesa.so.0 (0x7f83393f3000+0x216df) [0x7f83394146df]
>     [    13.102] (EE) 6: /usr/lib/x86_64-linux-gnu/libEGL_mesa.so.0 (0x7f83393f3000+0x1ac0b) [0x7f833940dc0b]
>     [    13.102] (EE) 7: /usr/lib/x86_64-linux-gnu/libEGL_mesa.so.0 (0x7f83393f3000+0x16b7d) [0x7f8339409b7d]
>     [    13.102] (EE) 8: /usr/lib/x86_64-linux-gnu/libEGL_mesa.so.0 (0x7f83393f3000+0x16bc5) [0x7f8339409bc5]
>     [    13.102] (EE) 9: /usr/lib/x86_64-linux-gnu/libEGL_mesa.so.0 (0x7f83393f3000+0x10948) [0x7f8339403948]
>     [    13.102] (EE) 10: /usr/lib/xorg/modules/libglamoregl.so (glamor_egl_init+0x10b) [0x7f833e845c9b]
>     [    13.102] (EE) 11: /usr/lib/xorg/modules/drivers/modesetting_drv.so (0x7f833f083000+0x9dc9) [0x7f833f08cdc9]
>     [    13.102] (EE) 12: /usr/lib/xorg/Xorg (InitOutput+0xc08) [0x55f3d6e60288]
>     [    13.102] (EE) 13: /usr/lib/xorg/Xorg (0x55f3d6dc7000+0x56cd3) [0x55f3d6e1dcd3]
>     [    13.102] (EE) 14: /lib/x86_64-linux-gnu/libc.so.6 (__libc_start_main+0xe7) [0x7f8341bdcb97]
>     [    13.102] (EE) 15: /usr/lib/xorg/Xorg (_start+0x2a) [0x55f3d6e07b8a]
>     [    13.102] (EE) 
>     [    13.102] (EE) Segmentation fault at address 0x55f3d90000f7
>     [    13.102] (EE) 
>     Fatal server error:
>     [    13.102] (EE) Caught signal 11 (Segmentation fault). Server aborting
>     [    13.102] (EE) 
>     [    13.102] (EE) 
>     Please consult the The X.Org Foundation support 
>        at http://wiki.x.org
>      for help. 
>     [    13.102] (EE) Please also check the log file at "/var/log/Xorg.0.log" for additional information.
>     [    13.102] (EE) 
>     [    13.133] (EE) Server terminated with error (1). Closing log file.