INFORMATION: After the development of GRUB 2(used in Ubuntu 10.04,9.10) many things have changed for the booting options. So if your Linux installation is using grub 2.0 then this trick should work for you.
With Grub 2 you can no longer edit grub.conf or menu.lst files located in /boot/grub folder. In Grub 2, file is located in /etc/default with name as grub
1) Boot your Ubuntu
2) Open your terminal using (Alt+Ctrl + T or by browsing through Applications->Accessories-> Terminal)
3) Type the following command in the terminal(red color)
sudo gedit /etc/default/grub
: sudo allows users to run programs with the security privileges of another user (normally root)
: gedit is a text editor in Ubuntu
4) The contents would look like this:
GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian`
# Uncomment to disable graphical terminal (grub-pc only)
# The resolution used on graphical terminal
# note that you can use only modes which your graphic card supports via VBE
# you can see them in real GRUB with the command `vbeinfo'
# Uncomment if you don't want GRUB to pass "root=UUID=xxx" parameter to Linux
# Uncomment to disable generation of recovery mode menu entries
# Uncomment to get a beep at grub start
#GRUB_INIT_TUNE="480 440 1"
5) To change the BOOT TIMEOUT , change the value of the GRUB_TIMEOUT paramter.
In the above example, the value of GRUB_TIMEOUT is set as 20 which is equivalent to 10 sec .
6)Save and close the file.Switch to terminal again.
7)To make the changes applicable type the following command(red color).
8) BOOT to see the changes .