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在gnome中安装xubuntu，卸载邮件软件，登陆xfce时启动至桌面管理器时死机，下面是.xsession-errors文件：
/etc/gdm/Xsession: Beginning session setup...
Setting IM through im-switch for locale=zh_CN.
Start IM through /home/lin/.xinput.d/zh_CN linked to /etc/X11/xinit/xinput.d/none.
Checking for Xgl: not present.
Detected PCI ID for VGA: Flags: bus master, VGA palette snoop, 66MHz, medium devsel, latency 64
Checking for texture_from_pixmap: not present.
Trying again with indirect rendering:
Checking for texture_from_pixmap: present.
Checking for non power of two support: present.
Checking for Composite extension: present.
Comparing resolution (1024x768) to maximum 3D texture size (2048): Passed.
Checking for Software Rasterizer: Not present.
Checking for nVidia: not present.
Checking for FBConfig: present.
Checking for Xgl: not present.
/usr/bin/compiz.real (video) - Warn: No 8 bit GLX pixmap format, disabling YV12 image format
Starting gtk-window-decorator
gnome-session[8503]: WARNING: Application 'gnome-wm.desktop' failed to register before timeout
seahorse nautilus module initialized
Initializing nautilus-share extension

** (nautilus:8758): WARNING **: Unable to add monitor: 不支持

(gnome-panel:8757): Gdk-WARNING **: /build/buildd/gtk+2.0-2.14.4/gdk/x11/gdkdrawable-x11.c:878 drawable is not a pixmap or window
Launching a SCIM daemon with Socket FrontEnd...
Loading simple Config module ...
Creating backend ...
desc table has been created.
created a new fitx factory.
Loading socket FrontEnd module ...
Starting SCIM as daemon ...
GTK Panel of SCIM 1.4.7

gnome-session[8503]: WARNING: Application 'libcanberra-login-sound.desktop' failed to register before timeout


Tracker version 0.6.6 Copyright (c) 2005-2007 by Jamie McCracken (jamiemcc@gnome.org)

This program is free software and comes without any warranty.
It is licensed under version 2 or later of the General Public License which can be viewed at http://www.gnu.org/licenses/gpl.txt

Initialising tracker...
Failure: Module initalization failed
starting HAL detection for ac adaptors...none found
gnome-session[8503]: WARNING: Could not launch application 'evolution-alarm-notify.desktop': Unable to start application: 执行子进程“/usr/lib/evolution/2.24/evolution-alarm-notify”失败(没有该文件或目录)
Throttle level is 0

** (nm-applet:8833): WARNING **: No connections defined
ICEDTEAPLUGIN_DEBUG = (null)
Nautilus-Share-Message: Called "net usershare info" but it failed: ‘net usershare’返回错误255：net usershare: cannot open usershare directory /var/lib/samba/usershares. Error 没有该文件或目录
Please ask your system administrator to enable user sharing.

Loading simple Config module ...
Creating backend ...
SSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSdesc table has been created.
created a new fitx factory.
Loading socket FrontEnd module ...
Starting SCIM as daemon ...
GTK Panel of SCIM 1.4.7

Checking for Xgl: not present.

说得很明确