I have changed the following entry in grub configuration file as follows:
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash nomodeset"
After this change I am unable to login in ubuntu 14.04. Whenever I am login it is coming to same login window.
please suggest me what should I do now. I have tried to loging through window that comes after pressing ctrl+alt+f1 but not able to login through that as well.
Boot your computer. When the GRUB menu (the one that lets you select your OS) shows up, select Ubuntu and press 'e'. If this menu does not appear, keep pressing Shift right after the computer boots until it does.
After pressing 'e' on Ubuntu you will see some kind of text editor. Find the line that begins with linux and go to its end. Remove nomodeset from the end of the line and press F10. Ubuntu should boot.
Open a terminal window and run the following commands:
sudo gedit /etc/default/grub
Change the line GRUB_CMDLINE_LINUX_DEFAULT="quiet splash nomodeset" to GRUB_CMDLINE_LINUX_DEFAULT="quiet splash".
Save the file and exit. Then run:
sudo update-grub
Your system should be fine. Reboot and test it.
