启动时，lightdm 转储到 tty。GUI 界面不起作用 - 这是在全新安装 Ubuntu 12.04 之后，当从 USB 运行时，GUI 界面可以正常工作。
我有一张 NVIDIA Corporation G98 [Quadro NVS 420] 显卡。
我从终端调用 startx 后它仍然不起作用。我在 Xorg.0.log 中收到以下内容：
[ 327.718] (--) NVIDIA(0): Memory: 262144 kBytes
[ 327.718] (--) NVIDIA(0): VideoBIOS: 62.98.6f.00.07
[ 327.718] (II) NVIDIA(0): Detected PCI Express Link width: 16X
[ 327.718] (--) NVIDIA(0): Interlaced video modes are supported on this GPU
[ 327.756] (--) NVIDIA(0): Connected display device(s) on Quadro NVS 420 at PCI:3:0:0
[ 327.756] (--) NVIDIA(0): none
[ 327.756] (EE) NVIDIA(0): No display devices found for this X screen.
[ 328.010] (II) UnloadModule: "nvidia"
[ 328.010] (II) Unloading nvidia
[ 328.010] (II) UnloadModule: "wfb"
[ 328.010] (II) Unloading wfb
[ 328.010] (II) UnloadModule: "fb"
[ 328.010] (II) Unloading fb
[ 328.011] (EE) Screen(s) found, but none have a usable configuration.
[ 328.011]
Fatal server error:
[ 328.011] no screens found
/var/log/lightdm/lightdm.log
[+0.00s] DEBUG: Starting local X display
[+0.00s] DEBUG: X server :0 will replace Plymouth
[+0.02s] DEBUG: Using VT 7
[+0.02s] DEBUG: Activating VT 7
[+0.02s] DEBUG: Logging to /var/log/lightdm/x-0.log
[+0.02s] DEBUG: Writing X server authority to /var/run/lightdm/root/:0
[+0.02s] DEBUG: Launching X Server
[+0.02s] DEBUG: Launching process 1074: /usr/bin/X :0 -auth /var/run/lightdm/root/:0 -nolisten tcp vt7 -novtswitch -background none
[+0.02s] DEBUG: Waiting for ready signal from X server :0
[+0.02s] DEBUG: Acquired bus name org.freedesktop.DisplayManager
[+0.02s] DEBUG: Registering seat with bus path /org/freedesktop/DisplayManager/Seat0
[+1.38s] DEBUG: Process 1074 exited with return value 1
[+1.38s] DEBUG: X server stopped
[+1.38s] DEBUG: Removing X server authority /var/run/lightdm/root/:0
[+1.38s] DEBUG: Releasing VT 7
[+1.38s] DEBUG: Stopping Plymouth, X server failed to start
[+1.39s] DEBUG: Display server stopped
[+1.39s] DEBUG: Stopping display
[+1.39s] DEBUG: Display stopped
[+1.39s] DEBUG: Stopping X local seat, failed to start a display
[+1.39s] DEBUG: Stopping seat
[+1.39s] DEBUG: Seat stopped
[+1.39s] DEBUG: Required seat has stopped
[+1.39s] DEBUG: Stopping display manager
[+1.39s] DEBUG: Display manager stopped
[+1.39s] DEBUG: Stopping daemon
[+1.39s] DEBUG: Exiting with return value 1
/var/log/lightdm/x-0.log
X Protocol Version 11, Revision 0
Build Operating System: Linux 2.6.24-31-server x86_64 Ubuntu
Current Operating System: Linux oorn 3.2.0-23-generic #36-Ubuntu SMP Tue Apr 10 20:39:51 UTC 2012 x86_64
Kernel command line: BOOT_IMAGE=/boot/vmlinuz-3.2.0-23-generic root=UUID=b25ab072-077d-40f1-95a4-c7fd66acd2f0 ro reboot=pci quiet splash vt.handoff=7
Build Date: 07 May 2012 11:43:21PM
xorg-server 2:1.11.4-0ubuntu10.2 (For technical support please see http://www.ubuntu.com/support)
Current version of pixman: 0.24.4
Before reporting problems, check http://wiki.x.org
to make sure that you have the latest version.
Markers: (--) probed, (**) from config file, (==) default setting,
(++) from command line, (!!) notice, (II) informational,
(WW) warning, (EE) error, (NI) not implemented, (??) unknown.
(==) Log file: "/var/log/Xorg.0.log", Time: Wed Jun 27 12:51:45 2012
(==) Using config file: "/etc/X11/xorg.conf"
(==) Using system config directory "/usr/share/X11/xorg.conf.d"
(EE) NVIDIA(0): No display devices found for this X screen.
(EE) Screen(s) found, but none have a usable configuration.
Fatal server error:
no screens found
Please consult the The X.Org Foundation support
at http://wiki.x.org
for help.
Please also check the log file at "/var/log/Xorg.0.log" for additional information.
ddxSigGiveUp: Closing log
Server terminated with error (1). Closing log file.
答案1
好的，所以我想出了一个解决方案 - 清除几乎所有 nvidia。第一步是通过终端，因为我没有可用的 GUI。我跟着http://peniwize.wordpress.com/2009/07/27/how-i-solved-my-nvidia-driver-kernel-module-api-mismatchj-problem/ 基本上可以归结为以下几点：
sudo nvidia-installer --uninstall
sudo rmmod nvidia
sudo find / -type f 2> /dev/null | grep -i nvidia | grep -i \\.ko | sudo xargs rm -f
sudo apt-get remove nvidia-current
然后重启：
sudo shutdown -r now
这会导致低分辨率、不正确的比例（拉伸） GUI 再次运行。
然后，一旦一些 GUI 恢复，获取 synaptic 包管理器并清除名称中带有 nvidia 的所有内容，除了依赖于 ubuntu-desktop 的 nvidia-common（在我的情况下有两个 nvidia-common 包）。其他一切都正常。然后再次重新启动，我的旧桌面就会恢复到正确的分辨率。