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I wanted to change something regarding brightness control.

I changed the 20-intel.conf. I added a few lines of code to it.

After that Ubuntu is not displaying, it goes blank after boot.

I also tried going into recovery mode with the enable networking option to remove the code from the file.

But I am not able to change the text in the file in the terminal

  • as the file is read only
  • chmod says operation not permitted.

How can I solve this?

Zanna
  • 70,465
Mitesh Parekh
  • 1
  • and when you let it boot, so by that time it would be on login screen, did you try to go to console? Ctrl + Alt +F2 .... I guess that way you would be able to log in, do the changes (sudo nano) and reboot...I may be wrong, but I would try it. – RiddleMeThis Jun 21 '15 at 07:16

2 Answers2

1

boot into recovery mode

  • Switch on your computer.
  • Press and hold the Shift key, which will bring up the Grub menu.
  • Select the line which starts with Advanced options.
  • Select the line ending with recovery mode.

use a root shell prompt for the edit

Your computer should display a menu with a number of options.

Select the line ending with Drop to root shell prompt.

Run the commands

mount -o remount,rw /
mount --all
nano /etc/X11/xorg.conf.d/20-intel.conf

in case recovery mode doesn't work

If the file system always stays in read only mode

Try this:

Boot with a live DVD/USB.

Open a terminal, press Ctrl+Alt+T

type

$ sudo -i
# fdisk -l

Suppose fdisk reports that / (root), is /dev/sda1, continue running:

# fsck -y /dev/sda1
# mount /dev/sda1 /mnt
# nano /mnt/etc/X11/xorg.conf.d/20-intel.conf
guntbert
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kyodake
  • 15,401
  • I ran your above commands. I am using ubuntu 14.04 , so the file system always stays in read only mode. I have to change the file in the dir /usr/share/X11/xorg.conf.d any other ways ? – Mitesh Parekh Jun 21 '15 at 06:25
-1

finally it worked.

  • I started it in recovery mode using the enable networking option. it mounted all the file systems.

  • I used the commands 

    sudo touch DIRECTORY NAME
sudo vi FILE NAME

And then I was able to edit the file and boot normally into graphic version.

And also the brightness control works as well.

guntbert
  • 13,134
Mitesh Parekh
  • 1