ubuntu重新启动就黑屏的原因以及解决方法：
显卡驱动没有装好，需要安装ubuntu的显卡驱动，解决方法如下：
1.安装完ubuntu后，打开“系统” → “系统管理” → “硬件驱动” → 选择“ati驱动”进行安装，重启即可。
2.如果还是黑屏，需要按“ctrl＋alt＋f1”快捷键进入shell 界面，打开/etc/X11/xconf.org文件，根据以下代码提示进行修改，例如：
# xorg.conf (X.Org X Window System server configuration file)
#
# This file was generated by dexconf, the Debian X Configuration tool, using
# values from the debconf database.
#
# Edit this file with caution, and see the xorg.conf manual page.
# (Type "man xorg.conf" at the shell prompt.)
#
# This file is automatically updated on xserver-xorg package upgrades *only*
# if it has not been modified since the last upgrade of the xserver-xorg
# package.
#
# Note that some configuration settings that could be done previously
# in this file, now are automatically configured by the server and settings
# here are ignored.
#
# If you have edited this file but would like it to be automatically updated
# again, run the following command:
# sudo dpkg-reconfigure -phigh xserver-xorg
Section "Monitor"
Identifier "Configured Monitor"
HorizSync 31-101 ＃频率范围
VertRefresh 50-60 ＃刷新
EndSection
Section "Screen"
Identifier "Default Screen"
Monitor "Configured Monitor"
Device "Configured Video Device"
DefaultDepth 24
SubSection "Display"
Depth 24
Modes "1440x900" ＃分辨率
EndSubSection
EndSection
Section "Module"
Load "glx"
EndSection
Section "Device"
Identifier "Configured Video Device"
Driver "fglrx"
EndSection