It doesn't matter where, it just won't save any files. I have tried running gksudo gedit /etc/default/grub, because I am trying to change the quiet splash to elevator=deadline but when I try to save it, "Permission Denied"
When I type gksudo gedit /etc/default/grub, it prompts me for a password, then nothing opens. What should I do?
Well, normally you don't have permissions to modify /etc/default/grub, but you can do it with root privileges:
sudo -i #to get root permissions
gedit /etc/default/grub #to edit /etc/default/grub
If your gedit still doesn't open, try to reinstall it (using sudo apt-get install --reinstall gedit command) or use nano instead (nano /etc/default/grub).
gksudo gedit /etc/default/grubshould imply he is getting the permission to edit the file. – Dr_Bunsen Oct 22 '13 at 20:39gedit. – Radu Rădeanu Oct 22 '13 at 20:43