接下来会发生什么（我已经重复了几次）是：
- 安装 18.04.1（为了安全起见：最小安装，没有第三方软件包）。
- 重新启动，同时移除 USB 记忆棒。
- 成功登录 Ubuntu（仅一次）。
- 重启电脑。登录时，输入密码成功并按下回车键后，屏幕会变黑。最后我只好强制重置。
我很少能够稍后再回来，但不清楚是什么让它起作用（竞争条件？）。
在登录之前，我可以使用 Ctrl-Alt-F2 进入终端（startx如果有必要的话）。
NVIDIA 显卡：
david@david-Precision-M4800:~$ lspci | grep VGA
00:02.0 VGA compatible controller: Intel Corporation 4th Gen Core Processor Integrated Graphics Controller (rev 06)
01:00.0 VGA compatible controller: NVIDIA Corporation GK107GLM [Quadro K1100M] (rev a1)
/var/log/syslog以下是（尝试登录）的相关部分：
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: (==) ModulePath set to "/usr/lib/xorg/modules"
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: (II) The server relies on udev to provide the list of input devices.
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: #011If no devices become available, reconfigure udev or disable AutoAddDevices.
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: (II) Loader magic: 0x5624fd87d020
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: (II) Module ABI versions:
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: #011X.Org ANSI C Emulation: 0.4
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: #011X.Org Video Driver: 23.0
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: #011X.Org XInput driver : 24.1
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: #011X.Org Server Extension : 10.0
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: (++) using VT number 3
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: (II) systemd-logind: took control of session /org/freedesktop/login1/session/_34
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: (II) xfree86: Adding drm device (/dev/dri/card0)
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: (II) systemd-logind: got fd for /dev/dri/card0 226:0 fd 12 paused 1
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: (EE) Error systemd-logind returned paused fd for drm node
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: (II) systemd-logind: releasing fd for 226:0
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: (II) xfree86: Adding drm device (/dev/dri/card1)
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: (II) systemd-logind: got fd for /dev/dri/card1 226:1 fd 13 paused 1
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: (EE) Error systemd-logind returned paused fd for drm node
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: (II) systemd-logind: releasing fd for 226:1
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: (--) PCI:*(0:0:2:0) 8086:0416:1028:05cc rev 6, Mem @ 0xf5400000/4194304, 0xd0000000/268435456, I/O @ 0x0000f000/64, BIOS @ 0x????????/131072
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: (--) PCI: (0:1:0:0) 10de:0ff6:1028:15cc rev 161, Mem @ 0xf4000000/16777216, 0xe0000000/268435456, 0xf0000000/33554432, I/O @ 0x0000e000/128, BIOS @ 0x????????/524288
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: (II) LoadModule: "glx"
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: (II) Loading /usr/lib/xorg/modules/extensions/libglx.so
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: (II) Module glx: vendor="X.Org Foundation"
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: #011compiled for 1.19.6, module version = 1.0.0
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: #011ABI class: X.Org Server Extension, version 10.0
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: (==) Matched modesetting as autoconfigured driver 0
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: (==) Matched fbdev as autoconfigured driver 1
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: (==) Matched vesa as autoconfigured driver 2
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: (==) Assigned the driver to the xf86ConfigLayout
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: (II) LoadModule: "modesetting"
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: (II) Loading /usr/lib/xorg/modules/drivers/modesetting_drv.so
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: (II) Module modesetting: vendor="X.Org Foundation"
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: #011compiled for 1.19.6, module version = 1.19.6
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: #011Module class: X.Org Video Driver
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: #011ABI class: X.Org Video Driver, version 23.0
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: (II) LoadModule: "fbdev"
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: (II) Loading /usr/lib/xorg/modules/drivers/fbdev_drv.so
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: (II) Module fbdev: vendor="X.Org Foundation"
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: #011compiled for 1.19.3, module version = 0.4.4
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: #011Module class: X.Org Video Driver
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: #011ABI class: X.Org Video Driver, version 23.0
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: (II) LoadModule: "vesa"
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: (II) Loading /usr/lib/xorg/modules/drivers/vesa_drv.so
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: (II) Module vesa: vendor="X.Org Foundation"
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: #011compiled for 1.19.3, module version = 2.3.4
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: #011Module class: X.Org Video Driver
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: #011ABI class: X.Org Video Driver, version 23.0
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: (II) modesetting: Driver for Modesetting Kernel Drivers: kms
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: (II) FBDEV: driver for framebuffer: fbdev
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: (II) VESA: driver for VESA chipsets: vesa
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: xf86EnableIOPorts: failed to set IOPL for I/O (Operation not permitted)
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: (EE) open /dev/dri/card0: Permission denied
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: (WW) Falling back to old probe method for modesetting
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: (EE) open /dev/dri/card0: Permission denied
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: (II) Loading sub module "fbdevhw"
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: (II) LoadModule: "fbdevhw"
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: (II) Loading /usr/lib/xorg/modules/libfbdevhw.so
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: (II) Module fbdevhw: vendor="X.Org Foundation"
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: #011compiled for 1.19.6, module version = 0.0.2
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: #011ABI class: X.Org Video Driver, version 23.0
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: (EE) open /dev/fb0: Permission denied
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: (WW) Falling back to old probe method for fbdev
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: (II) Loading sub module "fbdevhw"
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: (II) LoadModule: "fbdevhw"
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: (II) Loading /usr/lib/xorg/modules/libfbdevhw.so
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: (II) Module fbdevhw: vendor="X.Org Foundation"
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: #011compiled for 1.19.6, module version = 0.0.2
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: #011ABI class: X.Org Video Driver, version 23.0
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: (EE) open /dev/fb0: Permission denied
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: vesa: Ignoring device with a bound kernel driver
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: (WW) Falling back to old probe method for vesa
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: (WW) VGA arbiter: cannot open kernel arbiter, no multi-card support
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: (EE) Screen 0 deleted because of no matching config section.
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: (II) UnloadModule: "modesetting"
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: (EE) Screen 0 deleted because of no matching config section.
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: (II) UnloadModule: "fbdev"
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: (II) UnloadSubModule: "fbdevhw"
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: (EE) Screen 0 deleted because of no matching config section.
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: (II) UnloadModule: "vesa"
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: (EE) Device(s) detected, but none match those in the config file.
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: (==) Matched modesetting as autoconfigured driver 0
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: (==) Matched fbdev as autoconfigured driver 1
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: (==) Matched vesa as autoconfigured driver 2
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: (==) Assigned the driver to the xf86ConfigLayout
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: (II) LoadModule: "modesetting"
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: (II) Loading /usr/lib/xorg/modules/drivers/modesetting_drv.so
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: (II) Module modesetting: vendor="X.Org Foundation"
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: #011compiled for 1.19.6, module version = 1.19.6
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: #011Module class: X.Org Video Driver
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: #011ABI class: X.Org Video Driver, version 23.0
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: (II) UnloadModule: "modesetting"
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: (II) Unloading modesetting
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: (II) Failed to load module "modesetting" (already loaded, 22052)
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: (II) LoadModule: "fbdev"
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: (II) Loading /usr/lib/xorg/modules/drivers/fbdev_drv.so
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: (II) Module fbdev: vendor="X.Org Foundation"
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: #011compiled for 1.19.3, module version = 0.4.4
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: #011Module class: X.Org Video Driver
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: #011ABI class: X.Org Video Driver, version 23.0
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: (II) UnloadModule: "fbdev"
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: (II) Unloading fbdev
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: (II) Failed to load module "fbdev" (already loaded, 22052)
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: (II) LoadModule: "vesa"
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: (II) Loading /usr/lib/xorg/modules/drivers/vesa_drv.so
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: (II) Module vesa: vendor="X.Org Foundation"
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: #011compiled for 1.19.3, module version = 2.3.4
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: #011Module class: X.Org Video Driver
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: #011ABI class: X.Org Video Driver, version 23.0
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: (II) UnloadModule: "vesa"
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: (II) Unloading vesa
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: (II) Failed to load module "vesa" (already loaded, 22052)
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: (II) modesetting: Driver for Modesetting Kernel Drivers: kms
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: (II) FBDEV: driver for framebuffer: fbdev
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: (II) VESA: driver for VESA chipsets: vesa
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: xf86EnableIOPorts: failed to set IOPL for I/O (Operation not permitted)
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: (EE) open /dev/dri/card0: Permission denied
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: (WW) Falling back to old probe method for modesetting
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: (EE) open /dev/dri/card0: Permission denied
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: (II) Loading sub module "fbdevhw"
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: (II) LoadModule: "fbdevhw"
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: (II) Loading /usr/lib/xorg/modules/libfbdevhw.so
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: (II) Module fbdevhw: vendor="X.Org Foundation"
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: #011compiled for 1.19.6, module version = 0.0.2
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: #011ABI class: X.Org Video Driver, version 23.0
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: (EE) open /dev/fb0: Permission denied
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: (WW) Falling back to old probe method for fbdev
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: (II) Loading sub module "fbdevhw"
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: (II) LoadModule: "fbdevhw"
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: (II) Loading /usr/lib/xorg/modules/libfbdevhw.so
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: (II) Module fbdevhw: vendor="X.Org Foundation"
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: #011compiled for 1.19.6, module version = 0.0.2
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: #011ABI class: X.Org Video Driver, version 23.0
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: (EE) open /dev/fb0: Permission denied
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: vesa: Ignoring device with a bound kernel driver
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: (WW) Falling back to old probe method for vesa
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: (WW) VGA arbiter: cannot open kernel arbiter, no multi-card support
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: (EE) Screen 0 deleted because of no matching config section.
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: (II) UnloadModule: "modesetting"
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: (EE) Screen 0 deleted because of no matching config section.
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: (II) UnloadModule: "fbdev"
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: (II) UnloadSubModule: "fbdevhw"
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: message repeated 2 times: [ (II) UnloadSubModule: "fbdevhw"]
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: (EE) Screen 0 deleted because of no matching config section.
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: (II) UnloadModule: "vesa"
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: (EE) Device(s) detected, but none match those in the config file.
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: (EE)
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: Fatal server error:
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: (EE) no screens found(EE)
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: (EE)
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: Please consult the The X.Org Foundation support
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: #011 at http://wiki.x.org
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: for help.
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: (EE) Please also check the log file at "/home/david/.local/share/xorg/Xorg.0.log" for additional information.
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: (EE)
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: (EE) Server terminated with error (1). Closing log file.
Sep 8 08:26:52 david-Precision-M4800 /usr/lib/gdm3/gdm-x-session[1341]: Unable to run X server
Sep 8 08:26:52 david-Precision-M4800 gdm3: GdmDisplay: display lasted 1.219869 seconds
Sep 8 08:26:58 david-Precision-M4800 kernel: [ 71.964576] ACPI: \_SB_.PCI0.PEG0.PEGP: failed to evaluate _DSM
Sep 8 08:28:28 david-Precision-M4800 kernel: [ 0.000000] microcode: microcode updated early to revision 0x25, date = 2018-04-02
Sep 8 08:28:28 david-Precision-M4800 systemd-modules-load[295]: Inserted module 'lp'
Sep 8 08:28:28 david-Precision-M4800 kernel: [ 0.000000] Linux version 4.15.0-33-generic (buildd@lcy01-amd64-024) (gcc version 7.3.0 (Ubuntu 7.3.0-16ubuntu3)) #36-Ubuntu SMP Wed Aug 15 16:00:05 UTC 2018 (Ubuntu 4.15.0-33.36-generic 4.15.18)
答案1
可能是机器缺少设备驱动程序。当我运行时，ubuntu-drivers devices它显示：
== /sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0 ==
modalias : pci:v000010DEd00000FF6sv00001028sd000015CCbc03sc00i00
vendor : NVIDIA Corporation
model : GK107GLM [Quadro K1100M]
driver : nvidia-340 - distro non-free
driver : nvidia-driver-390 - distro non-free recommended
driver : xserver-xorg-video-nouveau - distro free builtin
安装后nvidia-driver-390登录一直正常工作。
我不清楚这是否是错误所导致的，所以我暂时不会接受这个答案。