My daily work revolves around Windows, Putty. My laptop which runs Ubuntu 10.10 and Windows 7 as dual boot. I wanted to change the default boot conf to Windows 7 instead of Ubuntu (which I just use when I am messing around something ). Anyways, I logged into Ubuntu 10.10 and went to my know place to change boot configuration /boot/grub/menu.lst But to my surprise it is not there. Little looking around got me want I wanted. Below is steps you need to follow to change your default boot configuration. Go to Terminal - Type “ sudo vim /etc/default/grub ” . Change “ GRUB_DEFAULT=0 ″ to “ GRUB_DEFAULT=4 ″ Remember sequence start from 0 , if your OS is on 5th on the list, in boot menu then you enter 4 in the "grub" file. Save the file. Type " sudo update-grub ” in the terminal. Reboot and have fun with Windows 7 as the default OS to be booted. Output for my system. ahmed@ahmed-on-Edge:/etc/default$ sudo vim grub [sudo] password for ahmed: ahmed@ahmed-on