My development environment Ubuntu14.04
I use Ubuntu 14.04 usb boot. When I installed CUDA7.0, the black screen appeared. But, I can enter the console mode.
so, I tried to edit the /etc/X11/xorg.conf. but, could not be edited in readonly.
I tried it with "sudo", "su", "su - " by vim. The results of "ls" , it is shown below.
#ls -ls
-rw-r--r-- root root
I can't understand that this file can't be edited by the root authority.
#lsof |grep xorg.conf
there is nothing.
and I tried with recovery mode, It was the same situation. Please advice somebody.