Install the ATI driver on Ubuntu and go to the system black screen. [modify]

Fault 1: the Ubuntu icon resolution is very low and the icon is very large. After you hear the system sound, press ALT + CTRL + F1 to enter the command mode and enter the user and password. software: sudoapt-getinstallv86dhwinof2. view the resolution supported by the video card. sudohwinfo -- framebuffer is generally 1024x7681440x900. modify sudo

Fault 1: the Ubuntu icon resolution is very low and the icon is very large.

After you hear the system sound, press ALT + CTRL + F1 to enter the command mode.
Enter user and password

1. download the software: sudo apt-get install v86d hwinof
2. view the resolution supported by the video card,
Sudo hwinfo -- framebuffer
Generally, 1024x768 1440x900 is used.
3. Modify the sudo gedit/etc/default/grub File
Put the two sentences GRUB_CMDLINE_LINUX_DEFAULT = "quiet splash"
# GRUB_GFXMODE =. But be sure to remove # make it take effect www.linuxidc.com)
Changed to: GRUB_CMDLINE_LINUX_DEFAULT = "quiet splash nomodeset video = uvesafb: mode_option = 1440x900-24, mtrr = 3, scroll = ywrap"
GRUB_GFXMODE = 1280x800
4. Modify the/etc/initramfs-tools/modules file.
Sudo gedit/etc/initramfs-tools/modules
Add uvesafb mode_option = 1280x800-24 mtrr = 3 scroll = ywrap
5. Enable framebuffer
Echo FRAMEBUFFER = y | sudo tee/etc/initramfs-tools/conf. d/splash
6. Update the grub configuration file.
Sudo update-grub2
Sudo update-initramfs-u
7. Restart completed

Black screen after entering the system (for ATI graphics card. I am using the official drive black screen, HD3870 graphics card)
1. After you hear the system sound, press ALT + CTRL + F1 to enter the command mode.
Enter user and password
2. Modify sudo vi/etc/X11/xorg. conf.
Section "Monitor"
Identifier "Configured Monitor"
HorizSync 31-101 # Frequency Range)
VertRefresh 50-60 # refresh)
EndSection

Section "Screen"
Identifier "Default Screen"
Monitor "Configured Monitor"
Device "Configured Video Device"
DefaultDepth 24
SubSection "Display" # Display Sub-section (if you want to add a sub-section, you don't need to use it)
Depth 24 # display color Depth (if you need to increase the color, you don't need to use it)
Modes "1440x900" # resolution (depending on your situation. Write 1027x768 at flat screen)
EndSubSection
EndSection

Section "Module"
Load "glx"
EndSection

Section "Device"
Identifier "Configured Video Device"
Driver "fglrx"
EndSection

Then restart the instance ~~

If a prompt such as an xconf parsing error occurs, it indicates that the syntax is incorrect when you add it ~~, Both variables and values are tabs.
Check the fields following the Section. If you do, don't write it. Some order is different from mine. A bit in the first segment. There are shards at the end. This does not matter